Question regarding agent agreement

[Austin Li]

After purchasing a MF in SoCal area, I became interested in the Dallas area and perhaps look into buying our 2nd MF there. We met an agent through a referral but after sending me a couple of properties, the agent wanted us to sign a representation agreement before doing anything else. With our 1st deal, our agent in SoCal didn't make us sign anything until we were ready to make an offer (the offer and agreement came together).

Question.. which is more common/usual? Am I supposed to sign with an agent before s/he can show me anything in a particular area?

Thanks in advance!