How many in Vitality?
I know that I need 100ish dex and rest in str
Should I go first 10 points into Vitality?

You should probably go more than the first 10 especially if you aren't rich.

BUT I don't play hardcore so don't take my word as the truth wait for other peoples opinions..I just think that it would definitley be likely poor HC vitas should go +10 vit or more.