Put everything in a food processor, blitz, use.
It's ok to use a large portion of fresh herb stems - there's tons of flavor in the stems. No need to only use the leaves.
Some recipes use only parsley, some use parsley, oregano, cilantro and/or basil. It's OK to use lemon instead of lime. The water is in the recipe mostly to give the blender something to "churn" with.