Ad.1 Not the Two handed subclass. They trade the Armor bonuses of fighter to more damage for two handed weapons.
Ad.2 That's what Intimidate Prowess is for and Orcs have a bonus of their own. You think it might not be enough?
Depends if you want pure fighter or mix in few other things, you need dex 13 for dodge, you need int 13 for some defensive fighting, if you going into intimidation its good to mix in 3 levels of thug