There is not one definitive way to cook noodles in a wok, as it depends on the type of noodle you are using as well as your desired outcome.
For generally thicker noodles like egg or udon, you can simply boil them in lightly salted water until they are tender. For thinner noodles such assrudong or edamame, merely tossing them with a small amount of cooking oil and some water will do the trick. If you want your noodles to be extra crispy, try deep-frying them before adding them to your dish.