Thrown Weapon Fighter

Uh...take the relevant Focused Skill (Whips and Thrown Weapons)
Otherwise just look at Bow Fighter and definitely skip Mighty Archer, but the rest of the feats are useful...
Seriously tho...throwing Weapons suck unless they're barrels of gunpowder or Bombchymist extracts
Mechanically they don't suck, I'll just think you're a bit lame