I want to put a fan in my map and make it turn, how do i go about this.

Check in the model browser if your fan model has a turning animation; if it does, send it an input of SetAnimation. If it doesn't, create a func_rotating and parent your fan model to it. Then go about setting up the appropriate player clips, et cetera for the fan.

If your fan is not a model, it's even easier, by the way; just select all of the components of the fan, and tie them to a func_rotating. You won't even have to worry about player clips necessarily

Cheers, i now have it turning.