What can I do for a Living???

I am a third grade teacher who has been employed for 9 years. I recently resigned from my position to stay at home with my 3 year old son. I am taking kids in during the day and providing day care from about 6:30 a.m. until about 5:30 p.m. Needless to say, I am exhausted! I realize we are basically in a recession, but what can I do working from home using my skills (excellent grammar/writing) via the internet? I would love to write or edit for magazines, newspapers, or websites and I just don't know how to break into that market. I need to make about $600 weekly to pay my bills. Please advise!