Gasless Mig welding is supposed to be much harder than gas mig welding, as you can't see what the weld pool is doing, its similar to arc welding. Flux coated mig wire also costs more than normal mig wire, and when the weld has cooled you get a hard slag on top of the weld which needs to be chipped off (if you are good at welding it virtually falls off), also you can't go over a previous part of the weld without stopping and chipping off the slag as it causes impurities in the weld, making them very weak.
So I would highly suggest as a beginner, to get something along the lines of a Clarke 150EN, as you then have the power to weld everything on the chassis, where as with a 100A welder you will need to either buy yourself an arc welder (another skill to learn, and more money) to do the heavier gauge steel, or find a friend with a more powerful welder.
Also don't worry about investing in a welder now, as they barely depreciate in value, so you can just sell it after you've finished with it if you are not intending on keeping it.
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