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First off, you don't need extensive welding knowledge to plug those holes. Just follow this technique (and this is just for spot welding in holes):
1) Set the voltage extra high, like to the point where the welder just starts to sputter when you try to run a bead. If you're running flux core (which is perfectly fine), you'll want the voltage set high anyway since that's what it likes. You'll want a nice wide arc that lays a flat bead, not a little pinpoint one. If you're running a little 110v welder, I'm guessing it'll be about maxed out. Do not set your welder on what you're actually welding. Get some similarly thick scrap metal.
2) Clean at least a 2" swath all around the joint on both sides of the material. You'll want it shiny, shiny. And wipe it down with a solvent like mineral spirits, paint thinner, denatured alcohol, something along those lines.
3) Steel won't fuse to copper. Get a chunk of copper or brass at least 1/4" thick and find somebody to hold it with pliers on the underside of the hole you're going to fill. You'll want it wide enough to cover the hole completely and then some. This helps for several reasons:
--It keeps the underside of the weld from being contaminated by the open air. This won't be too big of a deal if you're running flux core, but it certainly helps.
--It provides a heat sink to whisk the heat away from the thin sheet metal, keeping it from burning through.
--It gives you a conductive bridge to weld across.
4) With the copper on the underside, slowly tack in the edges of the hole. It helps if you aim your arc half on the previous tack and half on the material you're trying to weld. Your tacks aren't even going to be half a second long. Since your voltage is set extra hot, you won't have any issues with a sputtery start or getting proper fusion. Tack one right next to eachother, following around the outer edge of the hole and slowly work your way in. Just to be extra cautious, I'd recommend a count of two mississippi between tacks and waiting for the material to cool completely between full passes. The one issue you may find with flux core is that if the flux hardens before you make your next tack, it may insulate you from striking an arc. In this case, either chip off the flux and then do your weld, or arc right next to the previous tack on good clean metal.
That should at least get you started.
From the looks of your sample welds, you are way way way too cold with way too much wirefeed. Like I say, really crank that voltage up until it runs a bit sputtery. That works well for spot welding.
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