Just don't get a Craftsman MIG welder! If you search back to last year or so, you'll see how mine died and how I waited 4 months for a part and then had it blow the IC board on me 3 days later. It may have still been under the second warranty but I was in a hurry to do my floors and cage so I fixed it myself, with a sledgehammer!
I now have a Hobart using a gas setup, it's so much easier than using the flux core! As for learning, just sign up for a welding class at your local college, it's the easiest way to learn. You'll probably start with oxy gas welding, stick, and then to MIG.
Owen