If I was a buyer, the info I'd want to know would be:
1. How many homes are we able to see in person? Is there a limit?
2. What neighborhoods/areas do you have above-average, specific knowledge of?
3. Will you be able to set me up to get listings emailed to me as soon as they become available, change price, etc.?
4. If I have questions about a specific listed home and you do not know, would you be willing to make reasonable efforts to find out?
5. When it comes time, what is the process for us to determine what a fair offer is on a home?
6. I am looking for [specific unique property type] (i.e. a home on a farm with a certain amount of acreage, a mixed-use property, etc.), do you have past experience helping buyers with [specific unique property type]?
Those are just the ones I can think of off the top of my head. Make notes on your cell phone, etc. whenever you think of random questions to ask and you should come up with a pretty healthy list.
Good luck with everything.
Scott Godzyk mentioned some good points about a having a buyers agent on your side. I would suggest you contact a mortgage professional to get an idea of what you qualify for. This should be the first step in the process.
A good buyers agent should be able help you with the whole process of buying a home. First step, get pre-approved!
P.S. I am located in Tennessee