So! The things that get in your way of commuting are tedious practical ones usually. Before you get going, sort out if you can shower at work, change, leave soggy cycling gear, lock bike safely, and deal with things like lights and locks and helmet when you pick up the bike.
Check out the route - if you are a non-cyclist, you may choose a "road" route, not realising there are bike only short cuts, quiet parallel roads, or particularly hazardous "cycle" lanes that need avoiding.
We have alongside our bike to work scheme, a monthly bike clinic, where they'll maintain your bike. Look about too for the small independent bike dealer/fixers. They are often fabulous, and cheap for maintenance.
Finally, keep an eye out and see if there are any "cycle training" courses, again, usually free (sustrans may have collated info) to train you in safe riding in traffic.
And then get on it!! Start one day a week, or cycle one way and get the bus the other, and vice versa the next day.
And you must get back on if you fall off.