Prepping your bathroom for tile requires some work. You do not want your tiles to crack in a few years. Far worse, you do not want mold or moisture. If you are renovating your bathroom make sure you take the time to do things right.
Preparing your bathroom floors. Here are some choices of what you can lay down before tiling (sub floor).
It is of course important to remove the toilet, vanity and tub before starting. Sometimes prepping your bathroom is more involved than the actual tile work itself!
Have a wonderful day!