Raquel,
First off let me say how Great it is that you have made the choice to Carry, and protect yourself.
There are Several Internet sites that have a vast Knowledge base for you to research.
Another place to start is an Local gun shop,Usaully they have Instructors availible.
Also, you can contact an Local Gun Club,or Range. Most of the time, they also have training Classes,Range training. You can also Contact the NRA.The NRA had Instructors Registeted in your area that you can Contact.
If this is your First time beginning to shoot,I would look,or Invest in an nice Revolver to begin with. It's very Important that whatever weapon you decide to purchase, that it fits your hand like an glove.
Caliber is not Important for your first time. Shot Placement is the best. As you progress in shooting, you can always move up to an larger Caliber.
My Wife Started out with an .22 Caliber then as she became more Confident in herself, She moved up to, and Settled into an .357 Mag by Charter Arms
Learning the basic Fundamentals of proper handling, and shooting. Until Finally she began to shoot better than myself.
I offered my advice, and help to her every step of the way. But in the end she completed all of her training, and Knowledge on her own.
I hope my Information helps you. Again It's nice to hear that you made the first steps on your own. If I can offer one piece of solid Information to you.
It would be, Dont rush yourself, relax become Comfortable with your weapon.
Dry firing in front of a mirror believe it, or not will help you 100% good luck to you.
Learning to Carry,Shoot,Clean, your weapon is the best way to become Comfortable with yourself, and your Weapon.