First Time

Okay so 1st of all I can’t believe I’m actually asking for this kind of advice on an app but here goes it...

I turned 18 a few months ago and I’m still a virgin which is so not a problem but I’ve been hanging out with this guy who I know for a fact is more experienced but he invited me over to “Netflix and chill” tonight around midnight and I want to go but I literally have no idea what the fuck I’m doing. Any last minute pointers? Also will it hurt? How do I know if he’s into it? Am I in over my head? I need advice on everything no joke. Also what is an appropriate outfit for the situation?