Send the listing, the address, or whatever documents the agent has given you. Within 48 hours you receive a written opinion on whether the property is worth a site visit, and a fixed quote if it is. Both at no cost.
Or write directly to geomsozzo@gmail.com. Every message is answered within one working day.
I read what you sent, check the property against the public records I can reach from my desk, and reply in writing. If I think you should walk away, I say so before you have paid me anything.
You receive a written engagement letter with the scope, the fee and the delivery date. Nothing starts before you have approved it, and the fee does not change unless you approve a change in writing.