Step one: Cut a hole in the box.
Here are a few suggestions before you commit to anything:
-Don't rush things, you are both on the same page about this topic which is fantastic. That doesn't mean you need to jump the sheets next time you see each other. There will be plenty of other loveual encounters in your life, but there will never be another
first one. Don't over-do it, but make it count.
-Get your own condoms, and practice applying them. (Do not be scared to buy condoms, it's entirely responsible and respectable, and has no age requirement.)
-Either watch a researcho or view a beginners loveual diagram. It's important to get a 'hole in one'.
-Understand the basic fundamentals of fingering, and 'eating out."
-Realize that there could potentially be a tidbit of blood involved.

Definitely make the best of it mate!