whew, i've been searching for this site since i last replied to you and i finally found it.
http://www.horns.freeserve.co.uk/mouse.htm
really informative site. when i was breeding all those mice... this is what helped me the most (other than joining some mice groups but make sure you don't discuss snakes and their food in the groups as it's not considered politically correct - most of the members are "mice as pet" owners!)
regardless, if you click on the feeding link you'll get some ideas for food.
as for housing. mice are best kept in smaller groupings. they don't often breed well in larger groups as their natural instincts of 'not enough food' kicks in. so one male to two female is the best set up and, if possible... having one or two males you move from cage to cage so the male is not present when the female gives birth is best. that way the female won't get pregnant again within minutes of giving birth. it's not healthy for her at all. instead, wait at least a week after the babies are weaned before re-introducing the male again.
hth,
aleesha