I just recently started eating a plant based diet, I don't call it being a vegan because if you're a vegan you could eat all the chips and candy you want. Lots of fruits and veggies, brown rice and whole wheat products. The less processed the better. Theres a documentary on Netflix called forks over knives, check it out
http://www.care2.com/greenliving/15-easy-vegan-main-dishes.html#13805796010971&action=collapse_widget&id=149510
http://www.care2.com/greenliving/grain-free-vegan-food.html#13805796971581&action=collapse_widget&id=2569055
That's a broad question. I would say this, though, because I managed health food stores for many years -- not everyone is suited to be a vegan. And most vegans eat by ideology, not by what's healthy -- a lot of vegan food, particularly prepared food, is loaded with hydrogenated fats and sugar and other things best not eaten. So if you're going to do it, learn how to get your nutrients first, and make sure when you do it that if it doesn't agree with you it might not be right for you. And learn what's very difficult to get in a vegan diet, such as methionine and B12, and learn how to get enough of them. In other words, if you're going to do it, realize you still need to eat healthfully.