**Finally, for a bathroom that doesn't have a perfectly square floor, can you please tell me the steps (mathmatically) on how to figue out how many vynyl tiles I will need. I need to know how to properly measure a room for its footage. Thanks!!
Seriously re-consider your choice of floor covering. Vinyl tiles over a period of time will allow water to penetrate underneath causing them to harden and peel up and possibly causing floor damage. A better choice would be sheet vinyl or new ceramic tile.