I would start on Youtube and watch a lot of videos.  Model man Tom is a good place to begin:

http://www.youtube.com/user/ModelManTom#p/p

I would click playlist and look for some of his older videos.  Also, here is another youtube channel:

http://www.youtube.com/user/santafe37s

This person has a bunch of the old PBS series on how to build models on their channel.