NZ Teacher looking at teaching abroad


I am a 39 year old NZ teacher with 12 years experience and a Bachelor of Education. I've taught a variety of subjects to a variety of levels, mainly Year 7-12.(ESL isn't one of them though)

I'm looking at teaching abroad next year perhaps in Asia or Arabia.

Although I won't be looking at taking my wife and daughter with me (at least at first) because I do have a family I need any options I'll consider to be financially viable.

I'm willing and able to do a TEFL course - if it raises my job prospects and/or earnability. Is a TEFLcourse worthwhile for me?  I'm sure it will teach me some good skills and look good on my CV but I don't want to commit to time, effort and cost if its not significantly worthwhile...

Any info and advice would be much appreciated!