So, I've decided I want to build a rack in my closet once I have money and have cleared out all the junk in there. However... I haven't a clue how to set up heating. What I plan on doing is putting the heat tape down along the shelf of the rack and controlling it with a dimmer, but that's the thing. I simply do not know how to set heat tape up, nor how to use a dimmer for heat tape or UTHs (I'm using a super simple rheostat from PetCo to control the UTHs on my two corns).

Considering I have pretty much no experience in construction (unless you count making hide places for rodents and snakes with a hot glue gun and popsicle sticks ), pictures would be helpful, as would being very thorough and explaining this like you would to a young child whilst explaining all the terms and such.