A vegan diet typically consists of legumes, vegetables, fruits, nuts, and grains. You don't need meat or dairy alternatives in your diet if you do not want them, but there are tons of alternatives out there. Some of these include tofu, tempeh, seitan, soy milk, almond milk, and coconut milk. Here's a list of common meat alternatives and information about them. There are several brands that are vegan-friendly including Amys, Morningstar (check their products, some are vegan and others are vegetarian), Earth Balance, Smart Deli, Daiya, etc.
Also, checkout out this Veganism In A Nutshell for various pointers on launching your veganism