When I got my license, the wisdom bestowed upon me from the fine folks at SABOR was that new licensees should realize you are interviewing the broker as much as they are interviewing you. Consider yourself and asset. You want to make sure that the broker is a good fit for you as much as you are a good fit for them. Ask about the commission split structure, desk fees, buying and selling for yourself/family, is phone duty required, are there monthly minimums (sales, cold calls, etc), bonus structure, the type of real estate they focus on (investment, retail, high-end, leasing, foreclosures, commercial), how is the in-house training, what kind of on-boarding process, lead disbursement and generation, advertising associated with your franchise, corporate franchise fees, web & social media, and a ton of other items.
Sit down and write out what's important to you in your job as a Realtor. Put together a checklist of questions to ask. If you did your training at SABOR, the book they make buy has a list of these questions in the back. I actually found this process really helpful when selecting a broker. I interviewed three brokers and went with the one I felt was the best fit. I have never regretted my decision, and I am glad I went into it fully prepared.