Getting used to a new camera

Since I graduate next week I had to return the school camera I've used for the last two years. So, it's finally time to dust off the Nikon my grandpa gave me and actually learn how to use it. Here's some photos with my friends from sunday while I was messing around with it.

For anyone who's curious, it's a Nikon D7200 with I think the original lens on it (18-55 mm, 3.5-5.6) I want to buy a new lens, probably an 18-135 mm, but I gotta research it more.