Do a LOT of research, before you take the plunge. Make sure you know exactly the situation you'll be getting into (classes, class sizes, expectations of your performance, etc.). Also make sure that you're fully understanding what your financial assets need to be, when you get over there, to get set up.
My niece and her best friend both did this type of work in Japan. My niece's friend went over first, ended up in a smaller town in southern Japan (can't remember where, exactly, but it was on the southern most of the Japanese islands). She loved the people and the children she got to teach, but missed some of the advantages of being in a bigger city, as well as some of the attitudes from the old-school way of thinking in Japan, concerning how women should be respected.....or NOT respected. Being female, as well as a foreigner, she dealt with one clown who kept talking down to her, until one of the native Japanese female teachers finally had had enough, and put him in his place.
My niece is still over there now, but is working for a company in Osaka, doing lessons over the internet. Her schedule is crazy (some days, some nights, weird times, etc), which makes for a weird sleep/wake cycle, and she really isn't that crazy about teaching over the internet. But she loves being in the city, and loves being there, along with some of her other American friends she's made since she arrived, as they all enjoy the culture, and they all speak somewhat fluently.
My niece's friend had a place already arranged for her when she got there, my niece had to find her own place (with some assistance from her company). That's why I said to make sure you realize what your financial requirements will be, and how often (and how soon) you'll get paid.
If you want more info, PM me with any questions you might have, and I'll try to get some answers from the two girls.