Congratulations on becoming a vegetarian!
Vegetarians don't eat any animals, including fish. Strict vegetarians and vegans also don't eat dairy products, including milk, cheese, and eggs. Your family probably already makes some meals and a lot of side dishes that are vegetarian. On days that the main dish is meat, eat the sides and try substituting a veggie burger, a bean burrito, or some seasoned tofu for the meat.
Some vegetarian meals that your family may already make:
Cereal or oatmeal
Spaghetti and tomato sauce
Peanut butter and jelly or hummus sandwiches
Salad (add some nuts and dried or fresh fruit to make it a meal)
Tomato, vegetable, or lentil soup
For some easy vegan recipes, go to http://www.veganoutreach.org/starterpack/recipes.html (try the cake! Duncan Hines frosting is good, or make your own) or http://www.thevisualguide.com/vegan.htm
Becoming vegetarian will save a lot of lives (over 2000 animals, by many estimates). Stick with it, even if you're not "perfect" right away. Start with the easy changes. For you, that may mean that you're vegetarian 6 days a week and you eat fish once a week (just until you get used to the new foods). Or it might mean being vegetarian at breakfast, lunch, and 4 dinners a week (and then 5 dinners, and then 6...). You'll be vegetarian before you know it.
Write back and let me know how it's going,