Home Lans and DSL for Dummies?

I am playing with the idea of setting up a home network connected to a DSL line, using wireless connections. I need to know about networks. I have a vague idea about firewalls, but that's about it. Is there a source from which I can drink some elementary knowledge as to networks? Thanks Dennis J. Tuchler Professor of Law 3700 Lindell Blvd. St. Louis, Mo. 63108 314-977-2793