It's important to have this discussion with your scene partner to know what they're comfortable with, but if neither of you feel a typical stage kiss (putting your thumbs in between over their lips while grabbing their face), hopefully a quick peck will be okay. People have different opinions, but I personally don't feel like a peck really counts as a kiss. If the dialogue doesn't state it, lots of directors are okay with a kiss on the cheek/forehead. I actually just had my second stage kiss tonight! I was really nervous about it (and you probably are too), especially since there were lots of our friends onstage. The first time won't be perfect, but it's not gonna be as bad as you probably expect. It's a lot more awkward leading up to it, and then I promise you'll both just get more comfortable as the production continues. Remember to use a lip balm and mint, and good luck!