An amuse bouche is something that you serve before you even get started. It tells your people that they are in for a special treat. Generally it is just about one (maximum two) bites.
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The appetizers generally follow your amuse bouche, but come before the main course.
Appetizers should be tasty, but not too filling. Familiar examples are taco chips with salsa at Mexican restaurants or egg drop soup at Chinese restaurants.
Here are a lot if suggestions and ideas from other cooking sites:
Your appetizers and sides should compliment whatever you are serving.