Getting the right Nutrients:

The one thing to remember is that you needs to replace the nutrients you are no longer getting from meat with other food. Major concerns for most people are protein, iron and b12(although they shouldn’t be since they are easy to get).

Protein
The average person only needs about 50 grams of protein per day. Protein is in everything, just look at the side of boxes. In todays world it is very hard to be protein deficient if you are eating a wide variety.

High protein foods include:
soy milk, tofu, nuts(Almonds, Cashews, Filberts, Hemp Seeds, Peanuts, Pumpkin seeds, Sesame seeds, Sunflower seeds, Walnuts (black)), seeds, legumes(Garbanzo beans, Kidney beans, Lentils, Lima beans, Navy beans, Soybeans, Split peas), grains(Barley, Brown rice, Buckwheat, Millet, Oatmeal, Rye, Wheat germ, Wheat, hard red, Wild rice), vegetables(Artichokes, Beets, Broccoli, Brussels sprouts, Cabbage, Cauliflower, Cucumbers, Eggplant, Green peas, Green pepper, Kale, Lettuce, Mushrooms, Mustard green, Onions, Potatoes, Spinach, Tomatoes, Turnip greens, Watercress, Yams, Zucchini), fruits(Apple, Banana, Cantaloupe, Grape, Grapefruit, Honeydew melon, Orange, Papaya, Peach, Pear, Pineapple, Strawberry)

Iron
Like vitamin B-12, iron is a crucial component of red blood cells. Dried beans and peas, lentils, enriched cereals, whole-grain products, dark, leafy green vegetables, and dried fruit are good sources of iron. To help your body absorb non-animal sources of iron, eat foods rich in vitamin C — such as strawberries, citrus fruits, tomatoes, cabbage and broccoli — at the same time you consume iron-containing foods.

B12
Vitamin B-12. Your body needs vitamin B-12 to produce red blood cells and prevent anemia. This vitamin is found almost exclusively in animal products, including milk, eggs and cheese. Vegans can get vitamin B-12 from some enriched cereals, fortified soy products.
References :

If you are considering becoming a Veggie, good for you. But I would recommend that you become a vegetarian and not a vegan if you want optimal health. A diversified healthy vegetarian diet can do wonders for your health.
References :
I am a vegetarian

A vegetarian diet can be both healthy & unhealthy depending what you eat. Just cos its labeled as veggie dosent mean its good for you.

however many illnesses are helped by going veggie as the body is pretty good at healing itself if given the right foods
the more raw fruit n veg the better

Animal hormones are meant for animals and unfortunately farmed animals are given extra hormones to grow bigger plus there meat contains pesticides, herbicides, antibiotics, chemicals and more.

Its important to look at what you eat no matter who you are.
I do find new veggies make the mistake of upping their dairy intake when they cut out the meat. Dairy is one of the worst foods for causing allergies and health problems.

To get all of your vits & minerals its best to juice fruit in the AM & veg PM
get a good supplement like "essential source" from Dr Joe Esposito
always eat raw food with your meal & include a little hemp oil in your diet every day for your omega 3 & 6
for Vit B12 – yeast is good or better still try nutritional yeast flakes sprinkled on your salads, in soups or pizza

there are over 18 cultures on this planet who live on a 100% planet based diet, they get less than 0.5% of the cancers we do and live on average over 100 years

all our needs can be got from fruit & veg – thats how the animals get them
References :
http://www.drjoeespoitio.com
http://www.credence.org/