White Monkey is techinally a green tea, but due to the big voluminous tea leaves, I would treat it as a white. When I make white monkey, I usually do 1.5 rounded teaspoons per cup (since I usually make two cup teas, that comes to 3 teaspoons). If you are just doing a one cup tea then I would recommend using 2 teaspoons.
Also remember that white monkey is a very light, delicate tea. So, if you are used to making black teas, then this will taste very different. Make sure that you get a whiff of the aroma before you drink it as that helps you taste it better.
Hope that helps.