I would suggest taking a stool sample in from one of the kittens to get a worming medication, such as Strongid-T. It is safe with young kittens. I would do this around 4 weeks old, and then worm again a few weeks later.
The first appointment should be around 7 weeks old for the first set of vaccinations, and then again at 10 weeks old for the FVRCP (rihno, calici, and panaleukopenia). I wouldn't recommend the FIP or Felv vaccination.
If you can find a vet who will perform pediatric spays and neuters, I would recommend taking them in at 11-12 weeks to be altered before they go to their new homes. There are many benefits to early alter for the kitten, as well as the adopting family.