Guy coming over for the first time?

So there is this guy I really like, and I am pretty sure he likes me! He was talking to my mom when she invited him over This saturday to watch a football game with my family. Keep in mind he's 18! I'm 20! She told him he could bring his best friend, but he said his friend wouldn't be interested and would just talk to me the whole time. My question is what can I do to keep myself calm, is there any rules or things I should know about like things to make sure don't happen or anyone have any war stories about going to someones house for the first time?

Guy coming over for the first time?
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