Well, radioguy, my short answer would be: don't.
OK, having said that, I see why you would want to get in, and they're probably the same reasons I did, and they're fine reasons to want to...sorta.
I don't really have a lot to add to what amfmsw said...sounds like he knows what he's talking about...so no sense in reinventing the wheel, but I what would add is: don't make radio your primary source of income...you'll make a little money, but that's it...a little money. Radio isn't the biz to be in if you want to make a comfortable living (and who doesn't?) unless you're willing to bust your a-double-s in sales, and I mean, bust it, but even then, you'll be under all kinds of pressure to hit numbers, bill, make budget, etc. Sales people, while they can and do make money, are under tremendous pressure.
If sales isn't your thing, dabble in radio part-time only, get your toes wet and have fun, but keep your job (or go for something) in an industry that will make it a lot more worthwhile financially for the time and work you put in. It may not be as "fun" as talking into a microphone and running a board, but there's nothing fun about having to decide which bills you can get away with not paying this month, unless of course, you have an insatiable appetite for bologna sandwiches and ramen and can't get enough of driving an old clunker that barely runs, and believe me, that eclipses any "fun" you might have quick.