Well, if that's the case, then get your shit together!
What's the story you're trying to tell about this company and their product?
How long will it take to tell this story?
How much must you shoot in order to get this?
Will it require audio?
Will it require music that may be under a copyright?
Will it require advanced editing?
Will you be doing distribution?
Will you need to buy gear in order to do something they ask for?
I mean.. ultimately you have to take all of this into consideration, budget it, and give them a proposal based on what they want done, what you need to do it, and how much time is required. Factor in your experience cost, Then, revise, revise, until everyone's on the same page and you can write up a contract. Ask for half of the funds you demand before you even begin production, that way you still get paid even if they say you fucked up, or aren't happy with the finshed product.
Just saying they have money to throw around doesn't mean you're worth them spending it on you. You have to be professional here.