My husband is veggie and I tend to eat a lot of vegetarian meals but still throw in the occasional fish or chicken just because
If you are interested in going vegetarian please do the research and make sure that you are eating balanced meals. There are plenty of protein sources available, so that shouldn't be an issue. I would suggest checking out The Flexitarian Diet by Dawn Jackson Blatner, it has some really good recipes and covers all the basic nutrition questions that you might have. It's a way of easing into the veggie thing if that's what you want to do.
I would also say that staying along the outside walls of the grocery store will help as well, fresh produce, meats, etc stay away from things in boxes