I remember being fresh out of high school and a Navy recruiter talked me into coming to his office. I told him I had asthma and he said that it automatically disqualifies me from serving in the armed forces. Then he told me that if I could make it two weeks without my medication for some type of training and just lie during my physical, once I got in, they would just start paying for my asthma med. Then he tells me has ADD and burned his parents house down when he was ten, but he still got in, it will be fine. Haha.
Anyways, if you are in the US, here is a link you might find helpful.
Home : Occupational Outlook Handbook: : U.S. Bureau of Labor Statistics
It will give you their latest data on predicted growth, wages and general information about a boatload of occupations. Good luck. Also, don't forget to pick something you actually like so you don't end up hating life later.