But what is the proper conservation I should use those four years in order to protect my investment, and how should I pack and ship the art once I sell it?
Meanwhile everybody is walking around with their fancy sleeves, researched unrolling techniques, flat files, pro framers, humidity controlled safes...
Id rather just keep myself the hell out of this type of thread.

Straightening is easy. I find a medium hot iron ...ideally use a steam iron but be careful not to spray too much water onto the print. You can use a hot iron but move the fucker quickly otherwise like when I do my speedos!!I always iron the back of the print rather than the front. If you iron the front some of the ink comes off but only a bit. Not a great problem but if your ironing another straight after it deposits on that one. Like my undies I do like to iron all my prints together. Ok if the colours match etc and just a few smudges. Just say artist condition when selling.

however as I say I iron on the back which leaves a nice inlay of the print on the ironing board cover. Which is great as gives a chance to see your print while at the framers.