moving from flux to gas...

[absintheisfun]

I have been using .030 flux for about 6 months now. I'm no pro, but I feel like I am getting more comfortable with welding, and I'm ready to start using gas. I have the guages and hook-ups with my current welder. What now???

I do need to reverse the polarity of the ground and the wire feed correct?

Now, what recomendations do you guys have for sheet metal?
What pressure do I set the gas to?

Size of wire, gas mix, any other extra safety precautions or things I need to take into account when using gas?


Thanks,
mcw