Yo ryoung - big welcome to this here forum, nice to have on board.
You've got lots to look forward to trying out the various apps from the repos.
I love looking through all the repository stuff, and still cant believe its all free to grab if i'd like
As you like trying out new apps etc, you may want to consider using Virtualbox as that way you can install whatever you want without it affecting your "main desktop" in any way whatsoever.
If your unfamiliar with Virtualbox, please just make a new post and you'll get lots of good advice on setting it up and using it.
Regardless, have fun