I have a hard time, like others have said, with the idea of a part-time real estate agent. It's not so much the part time bit, but the fact that you will not be available to take calls, show homes, complete contracts and addendums, etc. I have bought and sold quite a bit of real estate over the years, and it quite frankly annoys me when my agent makes me wait more than an hour for a call back. Working 3 12s during the week could greatly reduce your ability to be available for your clients.
There are still ways you could use a real estate education. Real estate investing is a fabulous way to make money, for example, and having a good understanding of the laws and contract and such would give you a leg up.