Congratulations, and commuting may be addicting. For me, getting a routine for everything from access badge to lunches helped a lot. Also as you continue you will see what you like and what you may want to change. I started with a backpack, and it didn't take long for me to determine what I can leave at work so I don't have to carry. I also looked for an alternate way to carry things. Personally, I really do not like backpacks while riding.