This is a big decision. Don't sign an agreement that you downloaded on the internet. Involve a lawyer. Verify sure you work with someone who is a registered broker-dealer or make sure your finder's services don’t require broker registration (for example mentoring, advising, introductions, but not closing the round). Consider paying a fixed-fee regardless of the outcome of the introductions to make this all easier.
Finally, CEOs and Founders who lead the fundraising themselves are most likely to be taken seriously. It's the best test to see if they will also be able to market and sell it to customers.