Welcome to the game! I hope you have some fun and meet great friends! My number one tip only really applies to you if your role-play but if you don't it's still a good one.
Don't just sit around. Ever. Go up to people, talk to them, ask them about their character. RP in local as you stroll around and you might even find other people join in, it's the best way to get into RP'ing if no advertised group can be found.
Most of all, just enjoy the game!