That's actually not that bad. Clean it with brake cleaner and coat it with the Yellow top WD-40. Let it sit for a second to penetrate. Then wipe it dry.
Ok, I'll point out a few quick thoughts on stuff to remember on your first flywheel tear down. Nut is Regular thread, but the Puller is Reverse thread. So it goes in counter clock wise. The threads gall easily! Check the end of your ebay puller. Check the flywheel. Use a pick tool or even a micro file to clean them up if you don't have a tap and dye kit. Be careful if you put air tools on the puller. You have to at least snug up the center piece. I've been using a 20v 1/4 impact to tear everything down and it's pretty good. Any thing more then that can do, and you're bound for broken hard ware and a torch either way.