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I would look at abobe's website or get the classroom in a book for indesign. Pretty good series and it will get you through the basics. You can check amazon.com and they have the used ones for pretty cheap.

Here are some online ones. I like this site and I get there mag. It isn't too bad. http://www.layersmagazine.com/category/indesign/

Also if you go to one of the big book stores there is an indesign magazine. It is done by the same people that do the photoshop magazines from the UK. Pretty good magazine.
 
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