@ginja Just an FYI from my very minor herding experience: both the dog and the sheep need to be trained. Green sheep will not do well with a green dog. I’d find an experienced trainer with sheep and start there and maybe have an experienced dog work your sheep for a while.
@ginja Head on over to r/dogswithjobs or maybe another herding subreddit for some people with herding dogs and flocks. You may be able to ask them for advice as well.