dh grew up seventh day adventist, so that means he grew up as a vegetarian. my kids have gone to sda schools which are vegetarian and also their summer camps.
if you want a resource for lots of books (cooking, health and informational) on vegetarian and veganism you can google the adventist book company (abc stores).
for vegetarian/vegan food products, while more mainsteam grocery stores are carrying them, you can find some good deals if you have an actual adventist store convenient to you (when i've gone shopping for school potlucks and family get togethers i've found some of the products a bit pricey at my large national chain store, if i had to buy them on a regular basis i'de likely hoof it to the adventist store and take advantage of the prices their bulk buying power allows for).
like others have said, make sure you educate yourself so you continue to receive the proper vitamins and nutrients your body needs.