You may want to change your tires to a larger size depending on what you have on there now and your frame and forks will permit. Schwalbe Marathons are preferred by many due to their puncture resistant qualities. A more upright seating position is good for commuting as it is easier to see ahead and that may lead you to a wider saddle than is good for a tucked in position on the drops. Some way to carry a load other than a backpack will keep your back less sweaty, and if the load will be lightish a rack that clamps on to the seatpost is a possibility. USB chargeable lights are good for travelling in poor light, both so you can see but also to be seen. Pedals that allow for street shoes are also useful. You can make these changes overtime, although tires and lights may be a priority. People who live in hilly areas will probably need gears, but if your ride is fairly flat a one speed is a possibility. When I commuted I had a Surly Steamroller with a rack, removable rear fender, forward lights with 400 lumens, a rear red blinkie, and two sets of wheels, one with Schwalbe Marathons and the other with studded snows, both 35 mm. That was so if roads were snowy or icy I could change quickly. I also had 2 way SPDs, so in cold weather hiking boots were an option. Since my headset, wheels and bottom bracket were are sealed cartridge bearing, my maintenance was usually just new tires, chains and brake pads. This may sound like TMI, but I thought an illustration of a commuting set up might be useful.
