No one has made this suggestion so I will throw it out there.
I recommend all beginners start with an DC arc welder. Look for an old 230V Dialarc 250(miller) or IdealArc 250. These machines are indestructible, and weld very well, and are available used for cheaper prices than many AC only buzz boxes. There is nothing these brute cant do except maybe thin body panels. Thats what an oxy/fuel torch is good for, the thin stuff and cutting metal. A good man running a decent torch and deliver quality cuts near that of a plasma, and an oxy/fuel set up can weld thin steel, aluminum, cast iron, stainless steel, and cast aluminum with the proper consumables
DC 7018 is absolutely beautiful to weld with and in 10 hours of concentrated practice you can have it down pretty well if you have a decent instructor.
Why I don't recommend Mig. Its been said that mig is the easiest to learn and the hardest to master. The reason is that you have a hard time seeing the puddle, and most beginners don't know what they are looking at to begin with. I have seen to many mig welds that look good in appearance visually fail because they were cold or contaminated. When I was getting my welders certifications I was welding with a industrial Mig machine and the welds were going in hot and looked gorgeous, but keep failing in the bend test do to porosity. Tried again with the instructor looking over my shoulder, said I did a perfect job, failed again. Instructor tried, it failed as well. Ended up being some slight contamination in the cable liner which when replaced fixed the problem, but the point is that even a professional welding instructor was getting visually appealing welds that were not up to certification. Now take a beginner and he doesn't even know what he is looking at.
With arc welding, if the weld looks good 99 percent of the time it is. Crappy weld appear crappy, there is no getting around it.