If I understand correctly though, someone came to you and asked you to composer a music track for him/her. But not only compose it, but also make the mock=up for the score, make the actual score and the parts. Right?
Well it depends on the client and the music.
Orchestral music can be paid for 1000$ (or more) per minute, if you're Jeremy Soule (in game music). If you're Williams I have no idea how high it goes. As to making the parts and allmy personal experience as a copyist was to get 30-40 euros (for an orchestra), per page. 10 pages? 350 euros (I made a discount )
I do remember that there are some charts around in the net, which could help you, but I don't have the time right now to search for the link.
Also the most important thing, is who you're doing this for: A company? an individual? a guy in Romania, or a guy in NYC?