Ok, here's what you do, step by step:
Ok. A few questions:
1) Do you have your parents consent?
2) Do you have and will wear pads and helmets?
3) Do you have at least $120?
Good. Okay.
1) Find a local skate shop or Vans or Zumiez outlet that sells complete skateboards. (pre-made) Buy a name brand. (ex: Element, Birdhouse, flip, etc. I recommend that you start out with a smaller deck, like 7.0-7.5 width, so it's easier to flip and ollie. You may upgrade later) It will cost about $100-120. If not available, look on these sites for a pre-made complete:
http://www.ccs.com (recommended)
http://www.skatewarehouse.com (highly recommended)
http://activemailorder.com
they will cost the same, if not less, than the completes at the store. Be ready to ask your parents to buy it for you, because they have shipping and handling, and may be only paid through money order or credit card.
2) You now have your board, now just skate around and try to get used to it. Don't try any ollies or anything yet. Just try pushing around, kickturning, ramp skating at your local park, (if you have one) etc. here's a good article on it: http://skateboard.about.com/od/tricktips...
3) Once you get used to it, try out ollying. It may be hard for you. Try taking tips from other skaters. No biggie.
4) You're on your own now, GO SHRED!!!
P.S. Go to http://skateboard.about.com/od/skateboar... to learn about the names of a skateboard.
P.P.S. e-mail me for any questions at k00lkid14@yahoo.com
Oh yeah, If you want to customize your board, aka a custom complete, here are the lists of things you should get:
decks: almost, enjoi, Darkstar, Baker
Trucks: Krux, Independent, Thunder, Tensor
wheels: Ricta
Bearings: Bones Reds or Bones Swiss (Reds cost $16, but swiss cost $40)
hardware: doesn't really matter, as long as it is 1" or higher
grip tape: doesn't matter either, but try out Mob Grip
Shoes: for a beginner, get No Skools or TNT IIs, from Vans. Intermediate is Fallen and etnies. The best is Fallen, though. Expert shoes are Emerica and Fallen.
note that it will cost more in a store than online (I bought my skateboard at a shop for $170 when online I could've gotten it for $116 INCLUDING shipping and handling)
GOOD LUCK!