Think about it now because you can get A's freshman year that will help a lot. They make your transcript look a lot better. You'll miss out if you don't get involved. Sports are pretty good, and the Greek system at WPI is huge. Do your homework before you join anything - make sure you can afford the time and financial commitment, and talk to people already involved in it for their opinions.
Email is great - take advantage of it.
If you don't have a clue, go to the CCC and grab someone and they'll show you the ropes. Everyone uses it to send messages on campus, and you can send to friends at other colleges too. I loved WPI, and would go there again in a second. I hope you find this information helpful. Good luck and best wishes.