I agree also on taking a class first, or at least have someone who knows how to weld show you some things.
When you're ready to purchase your first welder, my recommendation is to go for a 110V MIG welder. New or (good) used, Hobart, Miller, Lincoln, HTP, Century, it really doesn't matter all that much. Get yourself a shielding gas bottle and regulator too, because welding with shielding gas is infinitely more pleasant than welding with flux-core wire.
This way, if and when you're ready to move on to something bigger, you still have your 110V welder which you can take anywhere. And honestly, at least for me, 95% of the welding I do I can do with my 110V Hobart anyway.
Welding is so much fun and very useful, you'll really love it.