You know, for stuff that thin, that's not so bad for gasless.
Remember that in real life the stuff you'll be welding on is likely to be effectively twice that thick (joining two panels). Doing butt joints with gasless in 22 guage is more a case of very short runs, join them together, and apply grinder/flap wheel.
What's the minimum amperage? Can you convert to gas? What thickness are your final projects going to be in?
Stick it on gas with 0.6mm wire and have another practice, that set should easily cope with auto bodywork, my little clarke 90 manages to weld body panels quite well. I've found most bodypanels are around 1mm or thicker, unless it french, where it'll either be as thin as paper or made of plastic.
It certainly isnt as easy as a good welder makes it look. In fact it takes several years to get good at it. How my tutor at college can pick up any welding machine and squirt out a pristine weld, with either mig, arc, tig or gas, i have no idea. but ill bet it took a long time to get to that level.
Now with your 22 gauge is 0.7mm thats really thin. For that you need 0.6mm wire and a reasonable welder (no idea what make yours is. Just saying) Flux core will make it a little more difficult and look untidy unless you have a steady hand.
practice running a bead on at least 14 gauge (2mm) if you can get it.