I have an Unchained Monk at level 1 with the feat Two-Weapon Fighting. Using a full-round attack action with the Unarmed Strike Feat, do I get 3 attacks? (Main, FoB, TWF)
How would the attack bonus be modified if so?
Flurry of Blows states:
At 1st level, a monk can make a flurry of blows as a full-attack action. When making a flurry of blows, the monk can make one additional attack at his highest base attack bonus. This additional attack stacks with the bonus attacks from haste and other similar effects. When using this ability, the monk can make these attacks with any combination of his unarmed strikes and weapons that have the monk special weapon quality. He takes no penalty for using multiple weapons when making a flurry of blows, but he does not gain any additional attacks beyond what’s already granted by the flurry for doing so. (He can still gain additional attacks from a high base attack bonus, from this ability, and from haste and similar effects).
I think this quite clearly indicates that there is to be no benefit from the Two-Weapon Fighting line of feats.
As such, at first level and taking the Flurry of Blows action, an Unchained Monk will make two attacks at STR+1 (or DEX+1 if you have the appropriate setup), and the Two-Weapon Fighting feat provides no impact.