-No mistakes - 1000
-Vitals stayed above 75 - 500
-Completed with 275 left - 300
-6 COOLs earned - 200
This being your first operation, it's almost criminally easy. Because of that, there's really not much to say. You have almost no freedom when it comes to tools so just quickly do what you're told to. Make sure you get COOLs in as many things as you can. When suturing, I'd recommend doing many quick and wide passes over the lacerations.
When extracting glass shards, a good rule is to always be slow and careful. Normally this is what I'd tell you, but this operation is so short and easy that you can afford to just go crazy and try to do everything fast if you want.