Hi Pamela,
I don't know if I can answer all of your questions, but take a look at the salary survey we published. It has base salary and salary plus bonus figures for a leasing consultant, even by region. Here is a link to download:
www.multifamilyinsiders.com/apartment-fo...salary-survey-report
One quick note about having a realtor's license, I could be wrong, but I believe there are some states that require that by law. But again, I might be wrong, so check with someone else.