You need to get some vegetarian cookbooks and learn what you can cook with the ingredients that are non animal. Make ahead salads and things like that. Make sure you get balanced protein from your foods and enough B-vitamins, you can take supplements if you are concerned about it.
I have been Vegitarian my entire life and I'm perfectly healthy! I drink a meal replacement drink daily to keeping iron and protein at a healthy level. Herbalife is a good one. Good luck!
As long as your getting your proteins you'll be fine. Nuts, Tofu, beans, peanut butter - All of these things can be substitutes for meat. I've debated this myself recently. I'd probably just cut out like beef and chicken though. And be super selective about the fish I eat.