so.... your first crossfit WOD shouldn't be a hero wod... seriously. Theses are 30+ minute painstorms designed to test you, not make you more fit. so don't do Hamilton. but if you were going to do Hamilton:
sub your pull ups with jumping pull ups
as a beginner I would substitute your 3k row for 3 - 333m rows - 3km would kill your intensity
use a light bar for your OHP - is it OHP or push press?
here's a better WOD for you today:
7 minutes of burpees - as many as you can possibly do - killer workout with no equipment necessary