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Start here if you'd like Jody Collier, of WeldingTipsAndTricks YouTube fame, to get you going.
Mig welding basics, machine settings, fundamentals; getting started with MIG welding.
Jody Collier from WeldingTipsAndTricks explains one of the best MIG gun techniques for beginners.
These technique tips will help you get better penetration (yes, that's a technical welding term), proven by testing.
Now that Jody has you started, it's time to practice practice practice.
He'll explain some starting tips for voltage and wire feed settings, and will explain in a little more detail how to start refining your MIG welding technique.
One of the best ways to get a lot of practice with a small amount of metal is stacking beads on a tee joint.
Remember, "practice makes better" (because perfection doesn't exist).