To be honest it is REALLY difficult to be vegetarian and do keto. But it can be done. Eggs and cheese will totally be a staple. If you can eat fish that will help a lot. A lot of veg ketoers rely on tons of butter and oil for saturated fat, since it is needed on the diet to keep up with the high fat macro. Supplement losing all the protein from meat with protein powders and any kind of fat you can add in (coconut oil, heavy cream, avocados). Beans would usually be a no-go as they are pretty high in carbs. Depending on how low of carb you want to go, I'm sure you could fit them into your macros as long as you are below or at/around your daily goal.