What should I do, we both are bi and wanna kiss in 8th grade? help please?

I really like this girl (I am a girl) and I am in 8th grade. I know she likes me too. When we were at a sleepover we played spin the bottle and we kissed. I am hosting a small party in four hours and 7 of my friends are gonna be there. This girl (let's call her Missy) is going to be there as well. I know for a fact that she likes to french and make out but I have no clue on how to kiss her. My circle of friends and I are all bi and we are very comfortable with each other. Any tips on how to make a move? Missy is very bi (so to speak) and she has told me that I am a great kisser.