Mig welder

What is the model number of the welder? You should be able to weld with it as is.

If you want to convert it to a mig welder, Lincoln has a kit that comes with a liner and regulator for the gas. You'll have to get a bottle and a different type of wire. You'll probably spend another couple of hundred bucks to convert it over.

I'm not a good welder but here's what I can tell you. Check YouTube videos on flux core welding and get some scrap steel and practice. It's really not that hard to do. Weld it up and grind it down flat. Make sure your metal is clean before you weld it.