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I'm trying to determine a MOSFET for a circuit I'm building which will drive the gate of an N-channel MOSFET at 3.3v with an available current 40mA (**this will be driven using PWM at 4MHz), the MOSFET will be driving a load of 10A at 3.5v. I'm not sure what characteristic I should be looking at to create the most efficient circuit. I know that I'll need a low RDSon but I'm not sure if gate capacitance or anything else comes into play when choosing a MOSFET.
Appreciate any help!