If this is his first kiss as well, it might be terrible! Since neither of you are experienced you won't really know the difference but here are some tips:
slow and steady wins the race (unless you're in the heat of passion, which I can't imagine you will be with people all around you)
try and guide his tongue into your mouth with your tongue and some soft biting of his bottom lip will have him begging for more...
main thing: be calm, there's nothing to be nervous about because you're experiencing it together...and if anything, you'll have a funny story to tell when you're older...my first kiss, I almost drowned in his spit and I'm surprised I still have a face because he practically sucked it off...never forget practice makes perfect....