It is obviously not a good idea for anyone to send you a wire prior to you sending the Bitcoin to the buyer or a trusted party who will hold the Bitcoin until the wire is received.
It is also probably not a good idea for any buyer to be sending you any kind of bank information either which is kinda what you are implying you will need.
You're absolutely right, but I do not get the money, I am only an intermediary, all the money is received in an exchange of bitcoins and from here I send bitcoins to you.
And the exchange is very reputable and well known throughout the community, correct? The exchange is also going to guarantee that the bitcoin is going to be sent to the buyer in a verifiable way, correct?