I can't emphasize enough that the floor surface (linoleum, plywood, cement, etc.) must be clean and free of holes, cracks, dips or any other damage. Sand, dirt and grit will inhibit the bonding process, as will old adhesives or a glossy surface. Make sure your surfaces are dry before laying down adhesive vinyl floor tiles.
Leave the tiles in your home for 24 to 48 hours to allow them to adjust to the temperature. You will need to pry off any molding and replace it after you lay the tiles. Sun can damage or bleach tiles, so you may need a throw rug here or there once the tiles are laid. Don't take the paper off of the tiles and begin laying them until you are absolutely sure of your measurements.