Get the gas kit you won't regret it!
Also, once you gt the gas kit, you may want to step down to the .023 or .025 wire (and tips). It doesn't need as much heat, so you can weld a
little longer without building too much heat in the panel.
Oh, and get a really good auto-dark helmet. The $39 Harbor Freight models are OK for starters, but they are slow and have a small viewing window. Look around at Craigslist, eBay, etc for a Miller Elite, 3M Speedglas or Hobart XVX, to mention a few.