Brilliant start OP! You should change your user name though. My bedroom was my nemesis for years until decorating it forced me to sort it. I can totally relate to keeping on top of the rest of the house but just not managing the bedroom. I can tell you from the other side that it's amazing being able to clear it back in a few mins now.
If you drive I've recommend going old school and doing tip runs. I do a small load most weeks to keep a "clear exit". Clothes bank, book bank, cardboard, general waste, everything you need in one handy spot you pay your taxes for. Maybe you'll even find yourself taking furniture soon!
Ignore any paperwork for now. Just gather it in one place to deal with later. I would be aiming for 3 things. One - a chest/wardrobe of clothes you actually wear day to day, that contains no more than 3 "just in case" items (I swear they breed). Two, a small stock of special occasion wear that still fits. Three, a storage box, underbed drawer or vacuum bag of out of season clothes. Edit as you go, as more forgotten favourites turn up.