Congrats, you will love the phone. Dont know if this is your first smartphone or not.
What I did, since the it syncs seemlessly with GMail, is go through and trim and organize your Gmail contacts and emails. If you dont have a GMail account you may want to working on setting it up and moving your contacts over. I found being organized before helped out a ton.
Since I use my phone for my corporate email (exchange) and had address on both Gmail and exchange, in order to avoid duplicate listing (Gmail and exchange) I move all my personal contacts to Gmail and keep exchange for all my professional contacts.
There are a lot of great tips thought out the forum including what apps to get an what apps not to get. Also I would get a car charger, starting off the battery life is not that good but seems to get better over a course of a couple of weeks. Some people choose to install some Task Apps (cant remember the names) but I did not and really I can get the battery to last most of the day, but I charge it in the car and at my office.
Some good apps are;
Bloo - Facebook (Much better than the official app)
Shop Savvy - barcode reader (Really cool)
Good luck have fun and make sure you keep checking the forums they are the best source