Make sure the sub surface is clean.If it is not cement,you would have to add additive to the thin set addhesive to bond to the floor.Lay out floor from center of room off both walls.Snap line on floor to form a grid to fallow.Place the tile's in the grid depending on the size of the tile.If you lay 4 tile's on floor as example leave space for grout.You will have your grid square.With a 1/4" notch trowel place mixed thinset in the grid.Then apply some thin set to the underside of tile with trowel and remove excess with trowel for a good bond.If you place thinset on floor only and don't apply to underside of tile,they will all come loose in a matter of time.Good luck
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yes you can, but that doesn't mean that it's the best solution. the best way is to remove the old tile. period.
With thinset.
It is possible but I would not reccomend it. If possible remove the old tile before laying the new tile. If you want to avoid removing the old tile you can lay a cement board over the old tile before installing the new tile.
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I will not explain exactly how to tile but i will tell you that your floor has to be very flat, an 18" tile is harder to install when there are crowns in floor they are not as forgiving as a 12 or 13" tile and you will have unacceptable lippage in your 18" tile, for installing go to john bridges website.