Motor on a pic18f

Hey guys... Im working on controlling a fan using a temperature sensor...
I just need to know how to control the motor (theoretically one phase) using the pic18f.. I mean in hardware... what transistor do i use?.. i read somewhere that i SHOULD use a diode.. this true?

would one of the dsPIC range not be better suited ?

a transistor or a diode for what exactly ?

I just need to know how to control the motor (theoretically one phase) using the pic18f

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Is the motor running on 110 or 220VAC?