As for littertraining, don't count on your mice learning. My females never learned, and with mice, I don't really think you can train them easy... they just catch on by themselves.
For my males, they always did all their bussiness in one corner of the cage. I got a litterbox(the smallest size) and filled it with some YN and all their fresh poo's. They continued to do it all in that one spot..
I'll PM you the recipe when I get back from the game. =D