website of a flooring company, in a section called "How to set yourself to make hooked rugs".
It doesn't give a great deal of information - here's "The making process", from a flooring vendor's point of view:
It is always a recommended to have a good idea or to have a roughly prepared sketch or design so that you know exactly what needs to be done, and there are no trials and errors later on.
The second thing you should always keep in mind is the measurements and the dimensions of the room and decide accordingly if you want a small or a large sized rug. The size of the rug should be in proportion to the size of the room. Otherwise, it would be a complete misfit.
Another section deals with how to buy a handmade rug ... to look good on the hardwood floor!