I am not into brushless, but the motor sounds like the sort of thing intended to rev furiously. It would need either a VERY small prop or a gearbox with a big step down ratio. With brushed motors (cheap if you avoid the exotic stuff, you can just hook them up direct to power or work them through a switch) you fit a prop that looks about right, then find a motor of slightly greater diameter and preferably with more poles than the prop has blades. I don't know the size and weight of your boat, but a common answer is a 15 volt 385 running on a bit over half its rated voltage.
If the radio works, it should be fine, but best to check out its range capabilities (short course?)