Congratulations on the first commute. A rack and/or panniers can help a lot. I have a rack and bungee my backpack to the top of it. I also have panniers but I rarely use them.

Its great to get compliments and also helpful that maintenance is willing to make accommodations for you. Be careful about working hard though, they might expect everyday from now on (joking).

Like other posters mentioned you will soon realize what essentials you should take with you and what you can leave at home or the office. Some people will have a set of tools for the home and some for the office as well as a floor pump. Now you get to spend more time with your family so enjoy.