I had a quick course of database few years ago and I forgot a lot from there. So you can say I'm starting from zero. I will try to explain to you on what I want to do and a picture with what I did so far.

We have a small business at home to change tires on a car (winter tires, summer tires). When I customer comes and changes tires they usually left them in our shop and we store them on a shelfs in the basement. For easier explanation...