Be careful who you learn from.
There are lots of guys out there who can "weld". But some of the "welds" I've seen from these kind of guys are pretty scary. Being a bad welder is easy, being a good welder is not so easy, but it's not terribly difficult either.
Like others have said your best option is to take a beginner community college (or high school if your still there) course. That way you get real information and help from people who really know what they are doing, and you get to use decent equipment, and get to try various disciplines and materials. It will be good to get that kind of broad overview, then you will learn what kind of discipline you want/need to become really good at, and also what kind of equipment you want to invest in, good welding equipment isn't cheap, and cheap welding equipment isn't good. As a bonus if you take a HS or college course they may even let you weld your go-kart frame on their equipment as a final project. When I took welding in HS way back, I remember all kinds of student projects from winch bumpers, to squeeze chutes to (what I built) a flatbed utility trailer.
You are correct that wire feed is the easiest to learn, and probably most useful for various tasks as well. Some of the little 120V machines from Lincoln or Miller are pretty handy for light work and can be picked up for ~ $500-$600. I'd stay away from flux-core wire and use gas though, I don't like flux-core.