Just take it slow. There's no rush here, is there? As your relationship develops with the bf, it can develop with the child, too. Of course it seems overwhelming! Instant family! But, again, take your time. Plan some activities together, or maybe a slumber party! Pizza night! Heck, see how you interact with the kid. Think about how this child is feeling! S/he will want to get to know you, too, if you are important to dad! So, just relax, have fun, don't worry, and take your time.

And, a BIG HUG for all of you.