Oh wow, they are much bigger than I expected. Probably would do well with softened kitten food. Use water to soften it and not cows milk (not good for them). You can make it like mush if they have trouble with it at first.

They are very cute.

Probably best thing would be to keep them confined in a small area like a bathroom. Set up a small litter box and start getting them used to using that (should come naturally), water bowl and soft bedding. Hopefully they will take to the kitten food quickly. Kitten Chow seems to be a good one.