I have a listof partners I want to approach, I understand the benefits to their company revenue model etc.. now I need a great sales pitch to put out the calls and get them interested. Can anyone help me?
That's the sort of thing I do, as a copywriter, charging around $1500 for what you're describing.
A budget-friendly option may be to write your letter or email, then give it to a professional copywriter for a critique? It's a heck of a lot cheaper and may be all you need.