Teaching english while you can't speak english ? Everything OK with you ?
You can do all sorts of voluntary jobs, I do some internet marketing, just few minutes per day for the local university and this gives me the right for a yearvisa and workpermit.
Most is teaching english, but also lot of webdesign etc. Thais are terrible webdesigners so foreigners are welcome for this kind of jobs. What are you good in ?
You can't have a real job if you not have a workpermit, you should do a simple voluntairy job for getting the workpermit. Don't expect an impressing salary here anyway. Some live from selling stuff on Ebay, I just start trying this but still did not sell anything yet, might take long time and many trials before it eventually starts running.
Check this one:
http://www.thaivisa.com/forum/