Caesar is looking to create a low power radio station. Leo says the first thing to do is make sure he's operating legally. He should check the FCC website about operating a low power, unlicensed radio station. The FCC allows them, but only under certain conditions. Then, he can turn his attention to hardware.
A great website for learning about transmitters is Transmitter.org. It has a directory of low power transmitters in the Low Power FM section. Ramsey is one of the companies that focuses on them.