Congrats!

Molucass is right, you can't let them play at all. Mating can happen in as little as two seconds -- literally.

For toys and chews, my rats LOVE chicken bones. I always give them any bones that are left after I eat chicken, or turkey, or anything. You can also go to your local Petcetera, and they have a product called "Fortum Rawhide Honey Hearts." You can hang them up in their cage, and they will chew on them. I've never met a rat that didn't like them.

wanted two. I know to feed them those blocks (can't think of the name right now)
I think you mean lab blocks? Lab blocks actually aren't the best thing. I wouldn't let my rats eat them -- I have yet to find a brand that doesn't contain corn, as well as one that is low enough in protien for a rat. Rats should have below 16% protien, and I've seen some lab blocks go up to 26%! Much too high. Rats need low protien, otherwise they will get skin problems. It's much better to make your own food -- combine puffed wheat, pasta noodles, bran, soybeans, oatmeal, millet, wheat germ, bread, dog biscuits, lots of veggies; Stuff like that. I wouldn't trust the food you buy in most stores. If you feel like making their meals is time consuming, buy a low protien dog food and feed with veggies.

Good luck! I cant wait to see pictures. If you have any questions feel free to ask. There are a few other rat owners on PT and we can also answer your questions.