tktaylor1, I'm not a real estate agent, but my father is. He's been an agent and broker for 30+ years and lives in Nashville. I'd be happy to see if he'd be willing to trade emails with you or possibly even meet you for lunch some time.
As far as your basic questions. The typical commission on a sale is 1%, but there are various factors that can play into either raising or lowering that commission. To be a realtor you have to maintain a professional realtors license and that means there is a licensure test and there are annual fees/dues. Most realtors work with an agency, like my father is with Crye-Leike Realty. However, from what I understand you are an independent contractor of sorts and pay to be a part of an agency, but the benefits far outweigh the costs associated. For schooling, I would say basic business and marketing would be good. Finance is another option and would be beneficial as well.
All of real estate is about selling and networking. However, the field has changed a lot in the past 20 years with the advancement of technology. In the old days an agent would spend lots of time with buyers driving them around town and showing them properties. Now most buyers want to screen properties on the internet and typically narrow things down before even meeting with an agent. In fact, many people today buy a house without using a realtor at all. However, it's different for selling where there is a definite advantage to having a realtor involved. In this respect realtors are like marketing agents who use their network connections and expertise to help you sell your property in a reasonable amount of time and at the best price you can get. They will do a market analysis of a given area, research sale history, and can help by being knowledgeable about the legal and financial aspects that the average consumer doesn't know.
Speaking as the child of a realtor I can tell you that what I appreciated most about my dad's job was the flexibility it provided. Hours can be long, but realtors are free to set their own schedule. My father made it to all of my activities growing up and it's because he didn't have to punch a clock with set hours on a daily/weekly basis.
I hope this info helps. Feel free to PM me if you want me to talk to my dad.