Talking to upperclassmen

So me and my boyfriend broke up about a month ago and surprisingly I wasn’t as upset as I thought I’d be and moved on pretty quickly. I was actually proud of myself. So I recently developed a crush on and upperclassmen that’s In my study and has gym the same hour as myself. We even added each other on instagram. I’d like to start talking to him but don’t know whether I’d be better to start talking in person or DM him on instagram.

Any advice you guys could give me? I’d really appreciate the help😅