Cork can be installed unto plywood, concrete and drywall. However, take off any wallpaper before installing the cork
Place the cork in the room where you want to install them. This way they will acclimatize to it, preventing any future contraction or expansion.
Treat your wall as a floor. Find its center point. Draw a straight pencil line from the center of one wall to the apposite one. Do the same for the other set of walls. The center point is where these two lines will intersect at a 90 degree angle. This point will serve as your reference to install tiles. The first four tiles will be placed in the four segments created by these lines. Position the first four tiles in each of the four quadrants in a way that they line the focal point. Draw lines to the corners from this center point.
Some cork tiles comes with a pre-pasted adhesive layer. For others you have to get an adhesive glue. Apply this glue over the area you want to cork. Some adhesives come in tube form so you do not need any brush. At times you have to wait before installation to allow the adhesive to set so it is best to refer to manufacturer's instructions.
Follow the lines you drew to install the cork tiles. If you need to cut tiles to fit corners and edges, use a carpet cutter.
Once you have installed all the tiles, use the paint roller over the tiles to level them and get out air bubbles.