I highly recommend asking your son what he would like to learn about and then hitting the library for books on those topics. Especially the first year, it's nice to 1) get the child involved in the planning, since that makes it much more of a team enterprise, and 2) it's free and gives you time to get your sea-legs with homeschooling.

Until you see what he's really capable of doing, you'll probably buy the wrong things. I did! But you can cover a lot of ground for free with library books, and it lets you see what he can do.

Kriston