Decide how many types of cheese to include on the tray.
For a gathering of 12 to 15 people, 3 to 5 types would be appropriate.
Something sliced that can be picked up and placed on a cracker - Colby jack, extra sharp cheddar, Swiss, Monterey jack.
Something smoky - Gouda is my preference; smoked cheddar is another option.
Something blue and creamy - Stilton, Gorgonzola; keep them in a triangle.
Something tart - goat cheese is my preference.
Another creamy one, kept in a triangle - brie as it goes perfectly with fruit and toasted bread.
Additions - shaved parmesan; another type of blue; another sliced cheese.
Havarti and fontina are two great types as well.