i wouldn't recommend kata script early game, if u can play legit early then when u get an item or two u should use the script that's when it's good but early game it's garbage
I can change depending of your playstyle with katarina but i will give a few tips like if you are a more farming player focus more on the farming part but if you are a agressive player try to focus on the combo bcs thats how you will win your lane and get some kills fast