Also don't drink anything that someone hands you and says just drink it.
If they can't tell you want it is or what is in it then how can you learn?
Watch this. It makes sense. http://www.youtube.com/watch?v=-uj6a3lG4no
For starters, in order to not look like a "newbie", dont sit and slam down as much hooch as possible, as quickly as possible. Order something you enjoy, or think you will enjoy, and sit and enjoy it, the environment around you, and the conversation of good friends. Personally, i prefer cigar bars, as the conversation and atmosphere are stimulating, the drinks are usually less girlie and more enjoyable, and you are less likely to make an ass of yourself in such a genteel setting. Second, advice for drinking buddies: if you can find one, go out drinking with a paramedic or nurse. Ifyou know you're going to get trashed, have them put in an IV with a saline lock, and hook up a bag of saline before you go to bed. Best hangover cure ever invented. And remember: Professional piercers or tattoo artists are NOT safe drinking companions. Take it from one who knows.
The biggest thing is to find a place where there is plenty of people your own age. Get used to going out. Have fun and know your limits. Tipping will get you your drinks faster. Girls will get you to buy them a drink then take it to their b/f's. Just have fun and be safe.