You seem to be on the right path by saying you want to work with 10 of them. However, it doesn't sound like you're ready for your first customers, since you haven't talked with any of them!
While you think you have a great idea that will change the real estate business, the truth is that you don't know at all. You need to start talking to real estate agents. Send emails, phone calls, offer to take them to lunch, drop by their office. Talk about your idea (focusing on why they should care -- what will this do for them?). And -- importantly -- listen to their feedback.
Once you've had several in-depth conversations with 5-10 of these folks, you should know what they care about, and what the value of your product is to them. At that point, it should be easy to get your early partners to pay for the service -- after all, it was pretty much designed for them!
Also recommended: Steve Blanks "4 steps to the epiphany".
While you think you have a great idea that will change the real estate business, the truth is that you don't know at all. You need to start talking to real estate agents. Send emails, phone calls, offer to take them to lunch, drop by their office. Talk about your idea (focusing on why they should care -- what will this do for them?). And -- importantly -- listen to their feedback.
Once you've had several in-depth conversations with 5-10 of these folks, you should know what they care about, and what the value of your product is to them. At that point, it should be easy to get your early partners to pay for the service -- after all, it was pretty much designed for them!
Also recommended: Steve Blanks "4 steps to the epiphany".