Hey madi! Congrats congrats congrats! You are making a wonderful decision that i wish i made sooner! You will feel fantastic both physically and morally by making this transition.
there is a whole heap of information regarding the nutrients you need to keep an eye on when cutting meat from your diet. But they are all replaceable! Protein is the easiest to replace I think: tofu, wholegrains like brown rice, beans, lentils, legumes nuts and seeds. not to mention great meat substitute products available everywhere these days that are often high in protein.
Other things you need to think about are vitamin B12 (if you are still eating eggs they will cover you for that. if not then there are plenty of b12 fortified foods available) and Iron (make sure you eat your greens!)
The most important thing NOT to do is to just take meat from your diet without adding things in its place, that is when people get unhealthy from going vegetarian.