I just realised, how rude of us all!
Hi
@z33 and welcome to the forum.
I hope you stick around and take advantage of the wealth of information available from the forum members, who between them probably do know it all (as opposed to just being annoying know it all's

).
If you are new to the world of cycling or cycle commuting then there are some basic things you are likely to need.
As has already been mentioned, a track pump with pressure gauge to use at home is a good investment. It makes checking pressures and pumping up tyres so much easier. You should also carry a very basic tool kit, often just a couple of Allen keys that fit your bike will suffice but being able to tighten up a loose bolt at the roadside can often make the difference between completing your journey or having to push your bike/phone for help.
The most useful kit you can carry is the means of fixing a flat tyre. This should consist of a small pump, some tyre levers if needed and a spare inner tube. You might also need a spanner to undo wheel nuts if your wheels are not the quick release type.
Most regular riders do not attempt to repair an inner tube at the roadside but fit a fresh tube and fix the old one later in the comfort of their home or workplace. Some riders carry two spare tubes just in case, while others also carry a puncture repair kit for when it gets really serious! When commuting I do both!!
By far the best advice I can add to this, and I will make it my final point so as not to overload or alarm you. Practice replacing the inner tube at home until you are familiar and confident with the process of removing the wheel, removing the inner tube, refitting the tube (in the real world puncture situation you should always check the tyre to make sure the cause of the puncture is not still embedded in the tyre ready to puncture the new tube as soon as you re-inflate) then inflating it to the required pressure and refitting the wheel.
EDIT: When practicing, use only the kit you will have with you at the roadside. This way you know you have everything you need, how to use it and know it works.
Happy commuting
