First, go to your local library and borrow 2 books:

Todd Down's Bycicle Maintenance and Repair manual
Zinn and the Art of Road Bike Maintenance by L. Zinn

then find out which of your local bike shops offer the Park bicycle repair courses and go to one. This combination will get you everything you need in no time.
http://www.parktool.com/trade-resour...rk-tool-school

Some cities also have a bicycle coop that will let you wrench and teach you in exchange for your volunteer labor. That's also a great way to learn. Google bicycle coop and your city's name and see what pops out.