Talking. Talking is really really important, as Dez and Sammi said. For both of you, this is going to be a very confusing time. There are going to be all sorts of questions, concerns, comments. Things may not be exactly the same from here on in, but that's okay!
You still love your partner. Remember that, and things will go well
It is perfectly okay to be confused right now. Remember the important things, and work through what you need to. Don't be afraid to ask for advice, but (and big but) - don't let other people know unless you've got permission. It's a big deal for your partner, and he's probably scared and confused. Please respect their right to do things at their own pace.