Don't forget to put up a post-ride report!

I find that in sporting events and performances, the nervousness and anxiety ceases not at the end, but at the beginning. My guess is you'll be having fun within the first 500 feet.

It's nearly impossible to be unhappy on a bicycle.

As for riding in a group, many of the rules overlap with driving a car. Don't do anything sudden, be predictable, don't follow too closely, stay away from the idiots, keep your hands at 10 and 2. Err... wait... broke the analogy on that last one.