Proper Comm. RE broker etiquette?

[John Barnes]

In searching for commercial real estate to buy, I’m reaching out to a number of brokers in the area and explain to them what I’m looking for. 

#1: Do I tell them I’m talking to other brokers? They often allude to me speaking with others as if it is expected. 

#2: If a broker brings me a deal off-market, am I going to link up with a different broker to ask as my buyers agent? Or am I expected to have that broker work both sides of the transaction?

#3: If it’s an on-market deal as mentioned in #2, does that change who I have in my corner?