Need To Go Vegeterian

what is the best way to start out to become a vegeterian. But still get all my proper nutrition. Plus when someone goes vegetarian. Does that mean to eliminate all meat. Because see I am a very thin build person but need to go vegeterian because of Metabollic disorder Trimethylaminuria. But I'm worried I may loose weight and that is something I don't want to happen. Are there any advice, good books, magazines or websites that got information on this. If so any would be a great value to me. Also advice from any vegetarians would be a really big great help to me. Thank you so much. Tweet