But I understand your question. If I can rephrase it: "We found a Realtor and are thinking of using him. But we want to make sure we're not overpaying for his services."
So, do two things:
First, call other agencies and speak to other agents. Find out what they charge. There probably will be some variation, but most will be pretty close to one another. That'll give you an "average."
Second, move on to "fair." And there are two factors here. First, what is your Realtor proposing to charge versus the "average"? If--and I'm just making these numbers up and they definitely are not accurate (deliberately so), if the "average" was 5% and your Realtor was proposing 15%, then I'd worry. But something reasonably close--a percentage point or so--is nothing to worry about. But the second factor is far more important: What is your Realtor proposing to do for the fee? What's his/her marketing program? That's the real issue. How aggressively will your property be marketed? How will it be marketed? Have you received valuable information on pricing your property--information on other properties you'll be competing with? Information on recently sold properties? What sort of support does the agent's brokerage offer?
Those are the factors to consider to determine a "fair" fee.
Hope that helps.
Remember everything is negotiable in Real Estate Business. Unfortunately, I am not from the area that I can work with you but I am glad that you are considering working with a Realtor.
A good REALTOR can be found for a good price and may produce good, fair, or average results.
An excellent REALTOR can produce excellent results for a fair compensation that may be negotiated. Whats it worth to you is more the question you should ask yourself?
What are your needs and what are the results you are seeking. If you have a REALTOR or are looking for one, remember what I wrote and ask yourself if they seem capable and are they worth it. You will know.