Dean,
Id start with something with as little rust and bodywork as possible, and preferrably something that runs or just needs some drivetrain work. Modify one system at a time (drivetrain, suspention, brakes) and keep in running and enjoy driving it in beween these small projects. Blowing one completely apart can get overwhelming and cause you to give up if you havent been there before. Starting with small successes will build your skill and confidence.