The shawl is in a shape of boomerang, which is achieved trough the system of increases and decreases. The gauge is not critical, although it may affect the size of your shawl and the amount of yarn. Pick the needles so that you like the fabric, it should be open and airy.
The sample is knitted from two balls of yarn but of course you can make a smaller or a larger shawl. The pattern repeat is easy to memorize, it consists of 2 stitches and 4 rows.