The kittens will nurse as their primary source of nutrition for 4 to 8 weeks.
In a few days to a week, you will start to notice their little eyes beginning to open. Don't try to force them, let it happen as it will. If you notice a little gunk or crust on the eyes, you can take a little cotton gauze and dampen it with warm water, then gently gently gently swab the area to remove the gunk/crust, but again, don't try to force it.
Momma will take care of the kittens in ALL of their needs, including elimination. She licks them to clean off dirt from the fur and she will also lick their bottoms to stimulate them to eliminate urine and feces. Do not be alarmed by this. *grin*
Momma will teach them, when the time comes, how to eat solid foods and to use the litter box. It is a truly amazing process to watch, but Momma knows best, so let her do her job. You can encourage the little ones once Momma has begun her lessons, but other than that, let Momma do it.
As for when your little Momma-girl will be "normal" again, that is hard to say. It is an individual thing with cats. Some of them are absolutely wonderful Mommas and others just sort of do the basics and go on with life. Time will tell how your girl will be, but my bet is that she will be an excellent mother and you will have some sweet little babies who are healthy, clean and well-socialized in a few weeks.
For now, just watch, and let Momma's behavior be your guide. If she seems to get seriously agitated if you touch or pick up the kittens right now, then don't. You will want to start handling them as much as you can, but since they are so new and tiny right now, everyone is better off if you leave them be.
Abymummy suggested that you get a scale and I agree whole-heartedly. I got mine on sale at Wal-Mart for less than $10 and it really does make it easy to see progress, or in the case of a fading kitten, it can alert you to problems quickly so you can intervene. Make sure you get a scale that weighs in both grams and ounces, and get a daily weight on all of the kittens.
What I normally do is weigh them, chart that on a piece of paper along with color and gender and any other notes of interest ...
Kitten 1 - Boy - Blue Point: 5 ounces - Healthy and fat.
You get the idea.
Also, another way to tell if the babies are getting enough to eat is to look-see at their little bellies. The skin across the belly should be flat, streatched fully across and not at all saggy or wrinkly. The babies should be fiesty and vocal if you pick them up. They should sleep a lot right now, nurse a lot and generally lay around. But just give it a few more weeks and take my word for it, they will be running around like they own the place - which of course, they DO! *smile*
Best of luck, Lamb. We are here if you need us.