Most Helpful Girl
I would say you should stop stressing so much. I know it is a super huge deal but you cannot plan a first kiss. It will go a lot better if you just let things flow naturally. Don't overthink how you act, she likes you for you so be yourself.
About the tongue I would not do it on the first time unless you are absolutely, 100% certain she likes it.
Most Helpful Guy
The first mistake is trying to plan the kiss and so on. That's not something that you plan. That must come out in the moment. Stressing about it won't help you either. The only thing you can plan is where to go and what to do together. From there, just be yourself. Making a false cool impression is the worst you can do. If she really wants to begin dating and interested in you, she'll accept you just how you are. Both with your virtues and your oddities. I know a first date is a stressing and scary situation. But the best you can do is just try to relax and enjoy your time with her. And if everything goes smooth and you see she is having an awesome time and enjoying being with you, then you can spontaneously think about daring for a kiss. Good luck and hope it goes well. Enjoy!