Hey Timmy! If you don't have anything to do, I'd suggest asking people if they need help gathering materials, building things, etc. It's one of my favorite things to do because I love helping people, especially if they're making a very cool project. There's always someone out there working hard that could use some help! Not only do you make some buddies, but it can get you some good rep too, and that's always nice.
And as for socializing, you could always give a shoutout when people log in, and even possibly try out TeamSpeak, even if you don't have a microphone. It's a great way to get to know some of the mods, as well as many other interesting people. But hey, just remember to have fun playing.
See you around!