What do you want to teach? Where do you want to teach (local/overseas)?
Learning to speak Arabic is much easier than learning to read more classical Arabic. Which asian language are you thinking of learning? Most of them would be harder than Arabic.
If you're considering teaching overseas, teaching English overseas is quite popular (in Japan, the Gulf, etc). Good to see you wanting to pick up a language though - being bilingual pretty important, and knowing one language is more of a handicap than a norm these days.