I'm impressed that you got the couch in there.
I know a guy who built his own house, who put his couch into a room before putting the walls up. The couch is too big to be removed from the room. He was rather proud of that when he got divorced and his wife got everything except his couch, since it couldn't be removed.
Anyway, if it were me, I'd probably just put up some wire shelves from Lowe's / Home Depot. A few of
these pantry shelves, some angle braces and end brackets, maybe some drywall anchors and a bolt cutter to make it the length you need, and you're golden.
Also, if you could run some PVC pipe or something like
this flexible PVC from your closet, in the ceiling above your couch, and down the wall near your television, you'll thank yourself later for the effort now.