Snake, I gather you don't have a mentor. It is really best, if you're going to raise pure bred cats, to have someone in the club, or perhaps the breeder who sold you the queen to advise you. Of course, we're happy to help you, but I gather you don't have much experience with breeding. Please be assured that I am suggesting a mentor for your sake, as well as for the kittens. I realize you have been very conscientious about this litter.
I would try some pureed canned food now. Just give the kittens a taste on your finger every few hours. They will soon realize that it is easier to help themselves from the dish. Personally, when they were eating well, although they are walking through the food and bathing constantly
, I soften kitten chow so that it's quite soft, and add the pureed meat to it. They should be eating from a dish quite well within a week or week and 1/2. They are in a very fast period of development! Mother will continue to nurse them as well. I would feed them four times a day.
I increase the food as the kittens demand. If they are finishing what you prepare, mix more. If their little tummies are nice and round, and they are active, that's a good indication that they are getting enough to eat. A pot belly on a thin kitten is not a good sign, of course. That could indicate worms.
As far as litter box training, provide a kitten size litter pan for them. Keep it close, so they have easy access. Mother will teach them. She will not be able to clean up their mess when they are eating cat food. If you find a kitten in the middle of doing its "duty" in an inappropriate plade, just put it in the litter box gently, and scratch its little paws in the litter. It will learn quickly!
Regardless of how well they are eating out of a dish, be sure they stay with mother and littermates until they are 12 weeks old. They need this time to learn socialization with each other and with human beings.
If the kittens are not thriving, and you suspect a problem, they could have worms. Take a stool sample to the vet. Your vet will guide you in regards to vaccinations, etc. Here are some links that should be helpful:
I wish you the best!