Several story ideas that I have lying around, waiting to be given life, have Ranma being a model, a singer/musician, a movie star, some combination of those, and all of that jazz. The hitch, which is the main reason for why I haven't considered writing any of these stories yet, is because I know next to nothing about the intimate details concerning how things are done -- mostly in the technical and business sense. At the very least I'd like to know as much as I can about agents, since they seem pivotal for a lot of arrangements and such; like the qualifications for being one, the particulars of their job, and so on.
I'd rather not bother anyone by having them write out the information themselves, so if you know of any sites with information, or manga that actually go into detail about such things, pointing me toward those will be fine.