My Builder's architect submitted incorrect plans to the contractor as a result the 1st floor ceiling height now needs to be raised as per the correct plan of 9 Feet, from its current 8 foot height. The house is framed, 2nd story is up as well as the roof. The builder / architect have realized...

I completely gutted my bathroom. I can't figured out what goes down first the florring or the drywall. Can anyone help me out. I was thinking the subfloor goes down then the drywall on top of that then I tile. I'm really not sure. Anything would help me.