Welder suggestions

So my Dart's trim is coming off and the holes will need to be welded shut. I have access to a good welder I just was wondering if I was going to go with a mig welder what specifications on the amperage and stuff should i look for. It would be elec not gas. Since it is just sheet metal it shouldn't need much but I don't want to find out it is not enough.

Thanks for the input

justin