How to add teeth?

[SimonPlatten]

I am working on a model which eventually I will print, part of the model:

 I will be purchasing this:

https://www.amazon.co.uk/Dadabig-Printer-Timing-Pulley-Wrench/dp/B07XHRQ8H1/ref=pb_allspark_dp_sessi...

How do I add teeth to the wheel shown in the above image to be of the correct size for the belt in the link?

[SimonPlatten]

For you all for your time and responses, I am going to revisit this soon, waiting for funds so I can purchase a new 3d printer:

https://www.box.co.uk/Creality-CR-10S5-3D-Printer-(Black)_2324681.html

I have also purchased one of these:

https://www.amazon.co.uk/Anemometer-Measurement-Thermometer-Helicopter-Windsurfing/dp/B00KYL3VNS/ref...

[SimonPlatten]

Didn't mean to double post, sorry, removed this second copy.