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Yes, the key is whether there is a closed valve or not. The water supply and water should be turned off, and you can find a professional to take a look.
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Yes, close the water valve and prepare it for waterproofing.
The indoor ground is flat, and the feng shui is not very good. It indicates that the ditch is not smooth.
Change the toilet, change the size to a smaller one, the price difference is not needed, it should be negotiable.
After that, it is best to use it for three months before hitting it, because the floor is beaten once when it leaves the factory.
Yes, the ceiling can be installed in meters high, the ordinary ceiling is 20 cm, and if you do the staggered floor, you will need 30-40.
Block with floor tiles, glue the drain and seal it to death, and then lay floor tiles on it to make marks to prevent future toilet pressing.