Welcome to the club.

Quite a few folks on here will tell you to pack a bunch of stuff you'll get tired of carrying (spare tubes, first aid kits, etc.). Try it and see if you like it or need it (you do if it makes you feel better), but you may find (like i did) that there's not much point. Of course, that'll depend on you commute.

On mine, i pass two bike shops where i can stop to get a tube if i need it, but a patch kit hasn't failed me yet. I also pass by a handful of gas stations with free/50 cent air pumps so i often leave the pump at home. I've also never quite figured out what a small first aid kit is going to do for me if i take a spill. I keep one at work, school, and home that has some gauze, tape, alcohol, etc. If i get hurt bad enough to where i can't ride to one of those places, i hop on the bus or someone has already called the paramedics ... Point is, carrying around all that junk might be a waste.

In any case, i wish you the best of luck.