attic vent installation

how would i go about installing an exhaust fan to vent to my attic?

Easy. Cut a hole in the ceiling, run ducting through, put fan in attic. Caulk or foam around ducting once installed.

i think it leads to mold problems . if thats a concern do some more reserch

^ Depends. Where I live, my attic is very warm but close to zero humidity, so mold is not a problem. I vent into my attic but have a CF before it gets there, and some ona gel in the attic itself.

All i have is a 250 hps in my closet(2X6.5x8.0) with attic directly above so I was thinking maybe just a small fan installed directly in the cieling pulling old air out into the attic. I was worried about hitting boards or wiring or if it should just be sheet rock i have to cut through. I can have closet and room door and everything open so I think ill be alright without venting to attic. I have a high power 8 inch fan in there right now blowing at the light and above the tops of the plant with everything open and it stays the same temp as room.