This is a very open ended question - you may have asked how long is a piece of string.

The answer is a function of many things.  Demand, risk, return, timeframe, support, terms & conditions to mention but a few.

At the end of the day, this is completely subject to negotiation - and as we all know with negotiation, who is is the box seat??

Precedence is usually a good guide.  What exists for this client/model.  Are there comparable industries where bench mark comparisons can be made.  Are we talking international, national or state rights etc.

Happy to give you more information and guidance, but a lot more information is needed.

Cheers,

Craig