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Ok, dude, you can not just go camping for 3 weeks. It will be a disaster. Take weekend warrior trips and go someplace cool. Fly if you have too. Start small. You haven't done enough camping to go on a 3 week excursion.
Pic up some camping books/mags:
http://outside.away.com/index.html
http://www.patagonia.com/ (order a free catalog and look at the pics)
http://www.backpacker.com/
All the major magazines do a review of all the major national parks at least once a year. Go to the library and find a copy. Find a park that sparks your interest and go there.
As for shoe's
http://www.vasque.com/
again gore-tex (or generic breathable waterproof membrane) is your friend.
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This is good information wacki keep it coming.
As for the the length. I weekend or few days, sort of defeats the whole purpose. I'm looking for a challenge here. the fact that there is a very real possibility that it could be a complete disaster is what appeals and excites me. Im looking to challenge myself here.