Would you be willing to read what I have done so far and, in addition, give me some advice about getting it in the hands of a producer?
I used to do that, for a fee, but I don't do that any more, except for friends.
Certainly, if you assist me, I would not mind at all sharing proceeds with you.
What you are looking for is an agent. An agent finds a producer to pay you, and takes 10%.
I am working to get the synopsis for my screenplay exactly right. It took me a month to get the perfect log line.
Good! Most people don't spend enough time on their hook. They just charge ahead and write the script. Then they write the query letter. I've critiqued query letters in the past, for a fee, and about half the time, as I'm trying to improve the query, I can easily think of a better concept. Of course by then the script is written and nobody wants to rip up their script and write a better one.
Professionals do it all the time. They don't want to, but they do.
You will see that I am an accomplished writer. In fact, my mantra is that I steadfastly refuse to start a sentence with 'the', a habit left over from the promise of at least a grade of 75% in English Literature if a student submitted material exclusively without ever starting a sentence with 'the'.