I'm a newer agent, and I did a ton of research online. Then I made of list of what I wanted:
-Location- office had to be in an area near the kids schools, and the interstate (didn't want of lot of wasted drive time.
-Private or Franchise- private have fewer fees (awesome when you are starting out) franchise have lots of training (great for building confidence).
-Rental or Traditional - lots of agents are doing property management, that wasn't for me, but to hear them talk, there is quick, steady, income.
I then called the offices (three of each type) and talked to the broker. They were all very happy to speak with me and "sell" their office... everyone wanted to set up a meeting to show the office explain fees, answer questions and visit with me.
The location step cut out a TON of local offices which helped my decision making tremendously. Several phone calls later weeded out two more (bad vibes). Then I went and met with the final four, after that it was between two. I decided on a Franchise, the private didn't get many cold calls, and I didn't really want to beat the streets for work. I wanted Traditional Buy and Sell, not prop management. Prop. management seemed like too many balls in the air for me to handle. So the final decision came down to which broker I liked best and thought would adjust to my schedule (I have four kids and they come first).
As for questions: you probably want to know fee structure... Errors and Omissions insurance... Mandatory meetings?... any yearly office fees you will be expected to pay...
That's what worked for me!