You are going to have such a great time! I made my first trip to Coz this summer with my non-diving wife. I let my DM know that I didn't have a "buddy" and asked if it was alright if I just stayed with him. He said, "of course!" and there was never a problem, I kept in communication with him, and when my time was up I signaled that I was going up to my safety stop, he gave me the OK and I finished my dive.
I've also learned that, when I've never been someplace or the dives are of a group tour/sightseeing type, it's best to let the DM know what you'd like to see and then follow them as they find it for you! Remember to tip too (around $5 per tank is average).