This based on knowing someone who did it rather than actually doing it (which I would have if the doctors I saw when I was 11 and 6'0" were right. "He's going to be at least 7'0" lol" I could grow a full beard at 12, it was clear I just advanced early! Rant over): If you're only considering it, don't. It will take all your money and time for years until you're making a profit. The only way you'll make it by getting trained and trying to hit up the indies and take every booking you can is if it's your life. You will hurt, you'll have no real social life, no money and the only way you'll survive it is if it's your entire life.
He got passed up on so many promotions at his normal job where I worked with him because he came into work with stitches in his head, and he wasn't even working with a hardcore promotion, so your full time job (unless you have oddly supportive parents or are loaded for some reason) has to accept the shape you come to work in.
If you're only considering it and have an athletic background and a good look, I'd honestly just say roll the dice at an NXT tryout if you can get on one. Hell, Mojos making money. If you're going the "real" route, you have to know you want it and not just consider it because it will eat you fucking alive.
EDIT: I just accidentally agreed with simplythebest. Miracles do happen! Clearly you should pursue your consideration now