Glad to see you come around.
There are a few things you need to keep in mind:
You cannot purchase a handgun from a store (anyone that has an FFL) until you are 21. You can, however, purchase via a "private sale" at 18.
Also, without a CPL, there are many places you can get snagged with the laws. A CPL lets you CC but it also lets you OC in many more places. The Q gave you some good advice and a link to firearms in your other post. I would read it, many times over. IMHO, one needs to be very familiar with the laws before OC - especially without a CPL. There are just too many ways to end up under arrest.