I have commuted to work off and on for some time and have developed a number of tricks.
Make sure you have a storage area at work, a drawer, file cabinet, someplace to store toiletries, extra socks, undies, and also a complete set of work clothes. work shoes too. someday your going to forget something and a spare at work is awesome. I wear the same pair of work shoes at work every day so I just leave them there overnight.
Toiletries include baby wipes and deodorant. I also have tooth brush, paste, and mouthwash. Not much cost to have minimal toiletries at the office.
Become a morning person so you can get there 20 mins early. I start the coffee first thing so everybody is appreciative I am there the soonest. Since I am there so early, I walk my bike up to the cubicle to unload and then take it down to lock it up. Reuseable grocery bags are great for organizing work clothes, lunch stuff, cell phone, id etc.
Use panniers, bike racks, and cycle bags to hold stuff. Get the most capacity you can cause there will be times you want to stop at the store on the way home or when you do not need the winter clothes for the ride home.
Backpacks are a pain.
Have a full size floor bike pump at work. Always carry spare tubes and a onboard tool kit. Extra batteries for lights too.
See if you can get a stool in the handicapper spot in the bathroom. it beats using the floor to hold clothes when changing.
A towel to wrap sweaty clothes in when you arrive. Wash towel before you leave and place somewhere to dry. replace towel with clean one frequently.
In cold weather if you can make a hot meal when you arrive, that is awesome!
And the best part, always smile when at work, makes em wonder what you are up too!
Regards,
cRanky