Jean, it's so nice you took two babies! Do you know anything about their history? Were they abused in any way? Were they cared for by their mother? If everything was okay they will probably be all over you in no time.
There are a couple of websites with information, Marcie might know of better sources:
cat care more cat care My own wonderful cat, Baby Kitty, is lying next to me with her paw on my hand. She's batting at me as I type. Not very helpful but it's really sweet.