Belonging to a club really is your first place to start OP. You don't have to belong to one, but once you own your handgun you will want to shoot it and that can only be done at a club. The club will also take care of the ATT for you as part of membership fees more likely than not.
Buying a restricted: Again, I would point you to a club. Most clubs have range guns that members can use, and or, members who will let you shoot their guns. Be very respectful here though, and offer to buy ammo or offer cash...most (if not all) guys won't take it, but the offer in of itself is appreciated. Also, if you haven't shot a certain make, model, or caliber and have questions ask the guy. He's not going to think you simple for asking a question when you're a new shooter. We were all there at one time or another. What will be problematic for you is mishandling a revolver (as example), slamming the cylinder in and out like it's done in the movies. BIG NO-NO! And a guarantee you'll never handle another gun of his.
Handle and shoot as many as you can at the club before you decide what you like and what works for you. Your club will be a great place to buy used guns, as you will either know the guy selling it or everyone that are members will. Belonging to that communal setting greatly reduces the odds that you get burned for cash or a defective gun...(nobody wants to be labelled as "that guy").
For new guns, I would stick to either supporting dealers here or a shop local to you.
It really is all about the club/range. Owning one to polish at home will quickly become tiresome. You will want to shoot.
