I want to marry my african boyfriend and bring him back to australia. He has lived in cameroon africa all his life, he is currently on a 1 year visa studying in bangkok. We would like to marry in June and he come back to australia to start our married life. I am an Australian citizen, born and bred here. We would like to marry in bangkok, who do we need to get permission from?

This may seem like a very silly question, but have you physically met this person ?

Yes

Well for starters you're going to have to get Australian entry information sorted out.
Your local library or citizen's advice should be able to point you in the right direction on that one.

Check this out.. Australian Fiancée Visa: Australian Visa Bureau