I fell into proofreading by accident. I was doing temp work for an employment agency, and they sent me to a mail order company that needed someone to match the order forms to the invoices. I looked for errors in shipping prices, and the actual ordered materials, plus spelling errors.
When my mom was finally in a facility I could trust, I answered an ad in the paper for data entry, proofreading, etc. It was seasonal work...they supplied graduation supplies for preschoolers and kindergarteners. I did both data entry (MAS 90)and proofread the invoices. Eventually, I did nothing but proofread.
It helps to go through an employment agency, because they will test you on all your skills. I found typos in the paper they gave me for the typing test. :/
I wouldn't mind doing such work if I could do it from home. If I had to travel and also pay for childcare, it wouldn't be worth it. Do any businesses that you know of offer proofreading work from home?