Hi,
That should work ok but you may have to add a gate resistor (from gate to +5v in your schematic).
It appears that you are driving the gate negative, which is the best way to do it too.
Also, you dont need a crystal controlled uC oscillator. An RC oscillator built into many types of uC's should be fine.
Relays and other coil type devices (fans, etc.) develop high voltage spikes sometimes which bothers uC's on occasion. That happens when the coil is open circuited after being energized.