I suggest you Google "spaghetti squash recipes", or go to some websites like Sunset Magazine, Cooking Light, or Epicurious.
Spaghetti squash is wonderfully versatile and can be used in soups, salads, or main courses. Some vegetarians like to pull it from the shell (after cooking) and top with spaghetti sauce (some veggies in there are good too), and have it as a main course with salad, whole-grain bread and dessert.
Hope that helps.
Pat Baird, MA, RD, registered dietitian