It's on now, wish me luck

Yeh it's got a bottle ( full too), and wire. I don't know what kind of wire it is or what's in the bottle though. What's the best technique? I know with arch you want the "C" pattern anything special with a MIG? I have an old rusted '97 Ram rear bumper I can practice on so I can a least get a decent "pattern" until I need to adjust it for sheet metal.