Only use enough tongue to feel the other person’s tongue.
Be gentle with the first kiss.
Smile after you kiss. Or in the least laugh or giggle to show some emotion.
Swallow periodically during the kiss.
Participate in the kiss.
Make sure your breath is fresh by either brushing your teeth or having a mint or piece of gum.
It is OK to kiss someone on the first date.
And if not the first date at least during the second.
Always make sure the first kiss is when the two of you are alone.