Hello ya'll, i've never used a smoker in my life. I want to start out with an easy build but have a few questions. I'm looking to build a square brick smoker but was wondering how far the heat source should be from the racks. Also was wondering how many dampers for air flow i should put. Below I sketched a basic drawing of what i was thinking of building. Sorry for my lack of computer skills. I have two racks from an old BBQ im using. I also want to put some wheels on this thing so when im not using it i can put it my shed. Thanks for any help i can get.