You should check out the WAHM Well forum. That is the best place to find good info and resources. I have had a business for two years, and it is just *now* settling down into a routine. You know, getting to the point where I have defined processes in place and all that.
If you want something that you could do right away, consider medical transcription or maybe some internet-related field. My sister is a freelance writer and she works from home for different newspapers. My DH works from home too: he's a computer programmer.
Good luck! Definitely you should check the WAHM well, though, they will give you tons of stuff!
Jean