You should be able to find all the answers to your questions by conducting a search on this well-covered topic but I invite fresh discussion as well.
I can recommend you visit
http://www.expatriatecafe.com/ for more details. It's a site geared towards the United Statesen who wants to teach English in Spain. LOTS of useful information there. In fact, one of the owners/operators (Chica) is one of our original message board members.
Good luck! Saludos, MadridMan
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