Didn't mean to imply that you were expecting all of the answers from one post, but I just wanted to be explicit that solid career advice is priceless, and is best sought out from a professional.
If you go to any large bookstore and go to their career section, they have dozens, and maybe even hundreds, of books on career selection advice. The best way to attack the monstrous task of selecting a book is actually to look at reviews on amazon.com or other book-selling websites. I recommend any book that has self-test inventories that will help you identify your interests and professional strengths. Bonus points if these tests come in electronic format with the purchase of the book, and even more bonus points if there are additional electronic resources for help.
The internet is your friend in the case of selecting a book or two to help you through the process.
In the mean time, you can take the Briggs-Meyers personality test for free, and it can help you narrow down the careers that MAY (and I stress the may because it's really meant to be general guidance and not a hard-and-fast list of careers to investigate) point you in the direction of a few potential careers to look into.
Here's where you can take the Briggs Meyers test free:
http://www.humanmetrics.com/cgi-win/JTypes2.asp
Just answer the questions quickly - take 1-3 seconds at most after reading each question to answer and go with your gut. At the end it'll give you a 4-letter code that identifies your "type." Use the internet to search for more details about good careers for this type of person and browse broadly for this information, as you may find certain less credible sources vary widely and may be trying ot persuade you into purchasing more information or using some online college BS.
By the way - short note - DO NOT USE AN ONLINE COLLEGE. The degree is worthless and will only lose further value in the next decade. They are an abomination of education and aren't even actually less expensive than attending a real community or 4-year state college.
Best of luck to you with your career change. Change is good.