Congratulations on taking your life into your own capable hands. Don't worry if all this info seems so totally overwhelming. Much of it will become more familiar over time. My wife has Rheumatoid Arthritis and has trouble working a semi auto, but she's dead-on with her .38 revolver.
Find the next, nearest gun show (google texas and gun show) and take an educational field trip. Bring a notepad and handle everygun you see. This venue is not always the best to ask a lot of questions due to noise, crowds, etc, but find the 4 or 5 guns that feel best to you and fit your budget. Also look at all the carry options (holsters, bags, etc). Then take you list to a good gun store and ask all the questions you need to. Handle the guns again and ask about rentals to test them out. Some ranges also rent. Just as a reccomendation, I agree with the Kahrs. I have a cw9 and even though I'm a pretty big guy, I like the concealability. Good price too.
Then you can make an educated decision and don't worry about changing your mind later...most of us have unused holsters laying in a drawer Nothing is written in stone, you can buy and sell as you grow in knowledge and can better define your needs. Go get 'em