My girlfriend wants me to kiss her?

Ok im 14 and its my first kiss. Maybe hers. Shes my first serious girlfriend. and im going to my first date on the 29th. I have a plan set up. Kind of a lame silly plan but its 100% guranteed xD so our date is at the movies xD and well we've been dating for 4 months and were both shy. we've gotten alot less shy since then aha. and well i want to kiss her. How do i? I dont want to make a extremly akward moment.. So yeah. Im going to wear my best clothes. a hint of body spray and obviously gum and brush my teethe in the morning. But anyways. When should i kiss her? Because were gonna hang out after the movie. How should i kiss her? Etc. tips please?