Welding for the first time - need advice

ESP47 said

The flange tool is another good idea. I've read different opinions on whether or not it leads to more rust later on but I guess I could just always use weld through primer on the back to help prevent that.

I also watched a bunch of youtube videos all week but they didn't seem to help too much. The guys just kind of quickly explain what to do, pull the trigger for a second and a perfect weld comes out of it. Didn't work nearly as well for me in real life :D

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I use the weld-thru and seal from the back. Not sure what you would do to the back if you cant get to it when butt welding? The weld will rust quickly if not coated. I've used regular seam sealer or neoprene roof caulk - depending where I am on the car. The neoprene worked great under the floor pans.

Here's a site I found with some good info and short vids of the actual welds being done. Also I see they have added a paint section I need to check out.
http://www.mig-welding.co.uk/mig.htm