Just wanted to start off by saying I'm really glad to hear that people of our age (I'm 17) still have an interest in a dying hobby. Once you start transmitting you will never want to put the mic down! Before you go out and spend money on a radio, you need to be licensed by the FCC. This test will quiz you on the rules and regulations with Amateur Radio, along with repeaters, propagation, ect. The ARRL (American Radio Relay League) will tell you everything you need to know about getting your license. (http://www.arrl.org/licensing-education-training)
I'm assuming you're going to remain a technician for a while. Here are some tips:
Transmitting: Always listen before transmitting! One of the things that helped me become a good operator was listening to see how people talked, the "language" they used, and their techniques. Keep in mind, just because you don't hear anybody talking, doesn't mean there aren't people listening. DON'T EVER SAY 10-4
Radio: My first radio has an ht (Handheld radio) It was a Realistic HTX-202. That thing was bulletproof! I think switched to a dual bander (2 frequencies in one radio) which was a Yaesu FT-470. Then, I got my mobile radio that I hooked up to a power supply. That radio was a Kenwood TR-7800. Research radios before you buy them! Read reviews, specs, and other information. Don't go to Radioshack because now a days they don't have anything to do with radios! (If you're into scanning like I am, they have good deals on scanners)
Antennas: If you own a house, antenna arrangements are endless. If you're renting a place then you might want to talk to them before setting up a tower or something. (My family is renting a house so I am using a 2 meter magmount antenna) Don't worry if you don't know what I'm talking about, the ARRL will clarify.
Good luck with becoming a HAM Radio operator! If you need help with anything you can email me at kb1sbrbh@gmail.com
73 (That means goodbye)
KB1SBR (Call sign)
ALSO! Take a look at the links that were posted before mine. They can help you out a lot!