How about none. That is a decision you will regret in just a few short years. If you want to impress your friends, find another way. One that doesn't involved scaring your body. The time to think about the future and the mistakes you'll regret is now.
It doesn't matter what your height/weight is. Only you know which type of piercing you should get. Also, wherever you go to get pierced, they will offer their opinions however, again, only you know what you want and will like.
If you don't know what you want, you should wait a bit until you decide. But here are some things I've either experienced or heard about different piercings: Ear piercing- doesn't hurt very much but needs a lot of care so as not to become infected. Eyebrow piercing- well, it can ooze a lot if you don't take care of it, and on some people, the body will actually work the piercing out and heal completely. Or, it will leave a nice big scar. Personally I don't mind eyebrow piercings, but you have to be careful (as with any type of piercing) because some people won't hire you if you have one. Nose piercing- if you have allergies, don't get one. If your nose is running constantly and you have a ring it in, it won't feel good. But if not, I think you'll be fine. They are difficult to clean though. Lip piercing- oh geez. Don't do it. I have heard that its very hard to manage and after a while the fun will go away, and you'll just want it out. Tongue piercing- you have to be really careful if you get one. You can break your teeth by biting down on the ball/ring/whatever and your tongue can swell up, making it hard to breathe. Belly button/naval piercing- my sister got one and really likes it, but she is VERY diligent about keeping it clean. You have to spray it with some solution three times a day for a long time. And that can be hard if you're in public. I would recommend finding out if you're allergic to any metals before you get a piercing. Remember to think carefully if you get one because you can't really get rid of it. I hope this helped! You can also look up "pros and cons of piercings" and you'll find some things there that might help you decide. :)