I did a TEFL course with i-to-i as I wanted to travel for a while after school. I wanted to make sure I could fall back on a skill if I needed cash (I didn't fancy picking fruit). 3 years later and I am still teaching!
The i-to-i site is so helpful, you can find resources, jobs and chat to people like you. The courses are well set out, easy to follow and understand and the support is second to none.
It really has been a life changer!