Vaccines & Spaying

I suggest you start looking into vets in your area. Some vets are old fashioned and will not spay a female cat until 6 months of age - this obviously will not work for you. Others, specifically those that also do work with shelters, will do pediatric spays. They will have their own requirements per health, weight, vaccinations done before the procedure. 8 weeks tends to be the youngest most will do.

I'm glad you are thinking ahead, though. But include a vet. They can help you set up the appointments for vacs (and your little one will have a few weeks yet before those can be started), deworming, etc. Ideally you'll deworm after she's off of and away from her mother because roundworms can be passed through milk. Aside from that if your cousin can keep her until she's 12wks old it will be far better for your kitten as she will have the chance to learn social behavior and litter box use from her mother and siblings (if there are any).

Vaccinations are a personal choice. Since she's inside there's little need for FeLV. FIV is unnecessary and a death sentence should a FIV vaccinated cat end up in a shelter (they'll test positive on an ELISA snap test for FIV).
Generally the best choice is to stick with just the Core vaccinations. Your chosen vet should know which ones are Core and non-Core. FeLV is a non-Core vac, for example.
While talking to vets you can ask which type of vaccinations they use. Adjuvented or non-adjuvented. The non-adjuvented is considered to have less side effects, but can sometimes also be less effective. If you can find a vet that uses Purvax for rabies, it might be a good idea to go with that. (a non-adjuvented rabies vac). 3-year rabies vacs do have some increased chance of reaction to the vac itself. So study up a bit. You also need to find out if your state/county even accepts the 3-year vac as valid should you choose to go with that one.

You have to do the kitten rounds and the first year after booster, after that it's up to you to determine what you will and won't booster. Only rabies is required by law.

Some vets, should you be a new customer with a new puppy/kitten, will offer discounts on the first visit.
In general, though, you should expect to spend $300-400 over the next 2-3 months getting vacs and spay dealt with. More if your kitten has an unforeseen health problem, accident, or you live in a high cost area. The latter is the other reason for calling around and checking out vets.

Kittens should have their first shot at 8-9 weeks depending on the vaccine (some require that they are eight weeks while others require them to be nine weeks). After the first shot they should have a booster in 3-4 weeks. The kitten does not have full protection until they second shot. This shot is a combo shot for 3 or 4 things. It's usually for panleukopenia (feline distemper, a horrible deadly disease), rhinotracheitis, calici virus and chlamydia. Some combo vaccines also contain a vaccine against feline leukemia but a lot of vets do not recommend it. It's not very effective, can give side effects and if the cat is tested for leukemia later, with the regular tests, it will come up positive because of the vaccine. The risk of getting leukemia is pretty slim, especially for an indoor cat. I don't vaccinate my cats for leukemia but i do give them the 4-in-1 shot which is very important.

When you get the kitten's first shots you may want to get her dewormed at the same time. Kittens should be dewormed twice a few weeks apart so you can do it at the same time as she gets her first and second shot. If she has fleas you can treat her for that at 8 weeks too. If mom goes outside fleas are a possibility.

The combo shot does only provide protection for one year so a cat will need yearly shots throughout his life. Just giving kitten shots and a shot at one year is not sufficient. If you don't give regular shots the cat will have no protection just like if she had never been vaccinated at all. Unfortunately a lot of people don't vaccinate their cats regularly after the first year or so but that doesn't mean it's right. Cats also need yearly checkups at the vet so it's a good opportunity to get that done when you get the yearly shots.
There is currently a debate about whether or not we are overvaccinating our cats by giving them yearly shots but most vets still recommend it. If you don't want to do that you can go to giving a shot every three years after age 2 or 3 after the cat has had the kitten shots and two yearly shots. But if you do that you should ideally take your cat in every year for titer tests which will see if he has enough protection for these diseases or if he needs to be vaccinated again. A titer test is a blood test. I'm not sure how much it is.

At 4 months a kitten should have a rabies test. You can do it earlier but I think it's best to wait until 4 months and most states don't require it until that age. The first rabies shot will be valid for one year. If you get the second shot right before the first anniversary you can get a rabies shot that is valid for 3 years. If you wait too long to get the second shot you can only get a shot valid for one year.

A kitten can be spayed the earliest at 8 weeks and 2 pounds. Not all vets do it that young though. Many will only do it on kittens that are at least 6 months. Call around to vets and spay/neuter clinics to see if you can find one that does pediatric spay and neuters.

Just so you know a kitten should under no circumstances be taken from its mother before eight weeks of age. To benefit the kitten the most he should stay with mom until 12 weeks of age. A lot of people are under the impression that you can take a kitten as soon as he can eat solid food and don't need to nurse but that couldn't be further from the truth. Kittens need a lot more than food from their mom. They need the emotional security mom and litter gives. They need to learn how to use the litter box properly. They need to learn how to behave themselves. Kittens take too early are more likely to have biting issues since they haven't been tought not to bite from their moms. Having the litter mates around is also very important. It gives emotional security and they learn a lot while playing and exploring together. Young kittens that don't have litter mates or other kittens around tend to have behavioral problems that can become quite difficult for their owners.
So please don't take this kitten until she's at least 8 weeks or 12 if you want to do what's best for her.

I'm curious, why can't you take the kitten until she's spayed? There are no behavioral or health reasons why a kitten can't go to a new home before she's spayed. Hopefully there is a place in your area that will spay a 2-months old but if not you may have to wait a few more months. Can she stay with your cousin until then if you can't take her?
Do you know if your cousin has any plans on having her cat, the mom, spayed? As I'm sure you know there are so many cats and kittens in this country and just not enough home. Only one in ten kittens born will have a home for life.

Good luck with your new kitten.

You're confusing FeLV and FIV vacs. FIV vac is the one that will test false positive. FeLV vac will not cause this, look up any veterinary reference (like Cornell which has good basic info on FeLV in an easy to read format) before making such claims. But the simple fact is, FeLV tests look for antigens, not antibodies that a vac would cause.

Though I do agree, and pointed out as much, that it isn't a needed vac. I think most of my cats that had it in the past reacted to it and for that I no longer have it done. Not even for my outdoor (read: contained, no running loose) cats.

What is this rabies test you speak of? Rabies testing of animals requires that their brains be examined.. thus that the animal be euthanized.