Spaniel's right, leaving a loaded firearm where UA persons can get to it is a big no-no.

Re: the room, build an ample-sized workbench. A 2x10' table is, for me, far too narrow. My bench is about 3' wide. I built a set of shelves, more like a shadow box, to go along the back side. I think it has 4 or 5 shelves. These are narrow, maybe 8" wide. A good place to put odds and ends...broadheads in one section, small tools on another, misc. cleaning doo dads...you get the idea. I covered the bench with a piece of scrap vinyl floor covering. The stuff is impervious to cleaning solvents (v. letting them soak into your wood bench, or laying papers down every time you clean).

I also found I often needed a place to lean a long gun. Corners are OK, but there are only so many of them. I build a floor rack that holds ten long guns, and mounted wheels on the bottom so it is easily moved.

Plan on a closet or something similar for hunting duds. Mine isn't enclosed, just a piece of galvanized pipe hung between a coupld of supports, mabye 8' long.

Cupboards and cabinets are good. Mine are what were in the house before remodeling. A drawer for this and a drawer for that...tools, eye protection, various gun parts, etc.

Have fun.