How to wire a cpu fan?

Ive been through all the trouble with trying to get those darn cpu fans to work. i ended up just buying a $20 electric heater which has a setting with a cold fan. Its way faster and it comes with a normal plug.
Peace

Gotta love RIU! Stripped an old computer and hooked the fan up to a 12v charger. I'm putting a few on the floor pointing straight up. Leaves seem to love it.