Does anyone have any advice on teaching English as a second language in Thailand?

I've been told that Thailand has local programs for TEFL certification, which also offer cultural orientation. Any recommendations of those?

Is it possible to get NON-B visa in Thailand consulate , outside of Thailand (Home Country) without having WP.3 letter?

Having existing Thai NON-B visa but leaving country without re-entry, because going to work in a Thai government school.

Supporting documents provided are teacher license, contract, copy ID of director, letter from government school and education ministry requesting embassy to give NON-B visa.

Thinking if Thailand embassy even don't consider letters from education ministry and government school , and ask for only WP.3.

Thanks in advance :)