Hold the torch at a 45 degree angle instead of going straight in on it. A few of those welds like good but most of them aren't
penetrating enough. When you get the smaller wire, I think you'll be good with some adjustments in your technique. Hold torch at angle, zap, move, zap, move. Maintaining a nice "dime on dime" pattern. If you have any thicker stock, practice on that with the thicker wire until you can lay a bead. Once you conquer that, you'll know what to look for on the thinner material. Rest your nozzle on the material and steady your hand. That helps with control.
You can get wild on the thicker stuff as long as it its thick enough to not burn through and you can lay a continuous weld. Some work the weld in a circle to get the roll of coins look, I prefer the half circle method. Use whatever method you're comfortable with. The main thing is getting the weld to be strong than the material. Get in a comfortable position. Waste some wire. You'll get there.
Its hard to explain this in text. I hope I'm helping and hindering. Hopefully some others will chime in who can add more technical info/critique/tweak what I've said
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