Having tiles untold bathrooms I always do the floor LAST this saves dropping tiles etc on to the nice new expensive tile. However, when tiling the walls first leave out the bottom row of wall tile (here you can place your straight edge datum, put in the floor tile then set that last row of wall tile and leave a 1/8" gap between the floor and wall tiles and fill with same water proof grout as the floor tiles have
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If it sits over a cement floor, then no. If it is a nailed down floor, then you can, but you still have to install a cement board.
Yes, but you should you use an adhesive that is ductile
yes, but it will slide over the years so I would not
You shouldn't. You need a surface that will allow the adhesive to make a good bond to. There are different types, read the instructions for the one you buy and apply it to the recommended sub floor.
Can you and should you are two different things. You could, but you wouldn't be happy with your results. It's always best to remove all old floor covering prior to installing new ceramic tiles. Whether you buy expensive tile or find cheap ceramic tile for sale, you always want a clean and solid surface to start with.