These are in my opinion the best sources for free and comprehensive curriculum you can find:
AMBLESIDE ONLINE (it has several free yahoo groups for support)
AN OLD FASHION EDUCATION (you’ll see a yahoo group too)
RUTH BEECHICK suggestions in A BIBLICAL HOME EDUCATION. This is the link to a group started by her where you can ask and read about how to run your Christian based Homeschool.
LIVING MATH (also a yahoo group)