Kansas,
Congratulations! As Oppalm suggested, some of the quirks of the HFGH are described in more detail on the GW board. I'll show you a couple things done with mine. These may not be correct for what you want to do with yours but may give you some ideas.
Siting is probably the most important and long lasting decision you will have to make.
Mine is South facing to receive full sun in the Winter, During the warmer months decidious trees provide shade.
Keeping things cool during a Kansas Summer is tough, You can always use shade cloth too.
Actually planted some more trees in front here to help.
Winter Heat ~ Electric ceramic heaters have been working well here, On the bottom shelf is a B&D 1500W utility heater that has handled the majority of heating needs this Winter.
I also load up the GH with water jugs, retains some heat due to added mass. The biggest benefit seems to be the moderating effects as to temp. swings.
Humidity ~ A bucket of water with a heater aimed at it is a good idea! Here I sunk a small tote in the ground to achieve the same effect.
Shelving ~ Wire mesh on a wooden frame, or set up on blocks,etc
Air circulation ~ Just been buying the cheap fans, these do run 24/7 and last about a year or two.
Even pulled some out of the old 'fridge. (upper right corner)
Be sure to give some thought to venting and an exhaust fan for this Summer. Wireless thermometers and automated controls are nice too. Wish I had some
Things can be as elaborate or simple as you like, Best of luck with it !!
Steve