New Florida Sales Associate/Investor

I recently passed the Florida RE salesperson exam and was wondering if anyone has advice on choosing a broker to hang my license with. I'm currently investing in properties in FL primarily, and I really want to save money on paying the realtor commissions. I also want to be able to use their MLS access so I can look at properties on my own time. So my questions are the following:

1) What are the pros and cons of joining brokers who charge a fee for each listing I want to put on MLS?

2) Has anyone worked with Redfin as a sales associate or assistant to SA with positive results?