That's a nice, friendly looking work space Ag. Good job.
When I did my work space/room in the garage I used slot board on the walls where I wanted to hang stuff and where the weight of molds was perhaps going to be a problem I added the metal slot inserts to reinforce the slots. I use 8" slot hooks and can hang three lead molds on each hook. I also used some nice clean 1 X 6 across a series of hooks as suggested for a solid shelf. Each spring I remove everything from the walls with the slot board and use the air hose and blower to clean the slots, then re-hang.