First of all, you need to be able to understand why the mold should be designed like a drawing, and pay special attention to those dimensions when checking (usually with special tolerances). As for the report, let the old man give you a sample made by others before, and just write it according to it.
If you can't even use the measuring tool, it's hopeless.
If you don't understand drawing design, you can consult a designer, and the general designer will teach you.