well, i've been a vegan for nearly two years and it's pretty damn easy.
whether your vegan, vegetarian or meat eater you want to make sure you supplement b12, over 60% of people are b12 deficient. (and that depends by what country your going with, in america the cut off level is 150, in japan it's 500, personally I like my levels to be at 1000).
stay focused on the grains (rice, pasta, oats) and especially fruit for breakfast, (15-30 bananas a day) you want to aim for 10g of carbs per kilo of body weight, and at least 2500 to 3000 calories, (you can go over but this is the minimum.
congrats on going veg, and don't worry about anybody saying you'll be nutritionally deficient, it's just ridiculous.