What type of vegetarian you’re seeking to become? (Vegetarian, Vegan, Fruitarian, Pescatarian)
So are you going to continue eating cheese and eggs?
Anyhow, if you haven’t started your transition phase, you want to start off with giving up red meat first for 2 weeks, then chicken for 2 weeks, then fish/seafood for 2 weeks. Or, try only eating chicken or seafood only 2-3 times a week for a month. Also, find recipes ( I make the best tofu burgers) and places to eat to inquire your taste in vegetarianism.
Mock meat brands - Morning Star farm, Boca, Amy’s Kitchen, Gardein, Lightlife (not my favorite), Yves, any type of tofu (can be found at Kroger, Trader Joes, Whole food)
Start eating at vegetarian restaurants.
You will need to start taking proteins supplements preferable vitamins and/or multi-vitamins. (Very Important)
Do not fall for junk food, regardless whether you become a vegetarian or not. Fruits are life savers.