Just a little helper with the insulation.
Try to use the rigid Styrofoam board insulation if you can, it does not get wet or moldy and it has a better insulating value or R rating.
Also make sure you let the joists dry out with a dehumidifier and a fan for a couple of days before you install the plywood. Sometimes the wood is wet and needs to totally dry or you end up with more issues.
Enjoy your room.