I think there's some great pieces of advice from everyone who commented thus far. I would agree with interviewing multiple brokers and/or teams within those brokerages to see who is going to actually give you the support you need starting out.
I've seen teams/brokers that will bring you in with a lower split, offer you a CRM and a dialer and then say "good luck", while others may have up to a 50-50 split but will be providing you all the training, leads, and support you need to be successful in year one.
Starting out I would be more concerned with training, support etc vs commission split, as I'd rather have 50% (along with all the experience, confidence and knowledge gained!) of 20 transactions than 100% of 5 transactions for example. You can always go out and start your own team or become a broker yourself after a year or two if you're killing it and have learned the business!
At my Keller Williams office my personal favorite class was Contracts class, where several times a week the most experienced agents in the office teach you about all the forms you will encounter (Purchase and Sales, Property Disclosures, listing agreements, lead paint, and so on) how to use them to your advantage and how to stay out of trouble by using them correctly! This gave me so much confidence as a new (and young) agent to do well by my clients that asking for the business became far less intimidating.
Best of luck with whatever you decide to do!
