It is amazing to me that so many people seem to be in the same boat. I was there last year too...and continue to "do it all" this year, with even more students.
My school did not have an E.L.L program in place, and no real idea of what the job should consist.
It is all fine and good for someone to suggest a TEFL course, but the reality is that many times, you need to hit the ground running and just "make it work".
I got a lot of great ideas online. Here are a few sites:
Easy Things for Beginners (Interesting Things for ESL Students) http://www.manythings.org/e/easy.
ESL Teacher Handouts, Grammar Worksheets and Printables - UsingEnglish.com English Grammar, Vocabulary, Pronunciation Exercises for ESL Teachers and Students
All of these have some free worksheets, tests and games available.
In addition, if your school does NOT have a current set of texts to work from, or a curriculum to follow...you may have to wing it...and set this up yourself.
I recommend the books from Pearson/Longman "Cornerstones" if you are teaching k-5. If you are doing middle school, their "Keys to Learning" is very good too. I don't work for them...I just found these books to be life savers. If your district has ELL money, have them purchase books.
I don't know what age you are working with. I taught high school Social Studies for 13 years before the move to ELL, and now teach kids in grades from Kindergarten to 7th grade. It is very different teaching K and teaching 7th graders.
There are also a lot of great high interest "reading" books from Oxford and Cambridge Press. "People, Places and Things" from Oxford and "Connect" from Cambridge are great.
Follow my advice and try alibris.com for buying books, they often have textbooks for LESS than half price, used. Or abebooks.com.
You have to be resourceful and pick people's brains. Best of luck!
T.Flannery