That is awesome! Getting a new bike is a great feeling. One thing you'll learn about this forum is: everybody loves pictures of your bike! It's fun to see what other people ride, especially when they are as excited as you are.
I suggest starting by just riding out and exploring the areas around you. Even the most familiar surroundings seem new on a bike. Then just start going farther and farther, and faster if you like. As you get more comfortable you can seek out group rides if you want. It might not hurt to have someone who knows about bikes look it over to make sure tires brakes, etc. are in good order (including adjusting things like your seat height). It could be a friend or your local bike shop.
Incidentally, I love Mahler's 2nd Symphony.