Darts are definitely not going to be the easiest or probably most effective weapon for your rogue build. Ranged sneak attacks are definitely harder to pull off than with a melee weapon. And you'll really suffer in early levels.
As for dazzling display at 3 you could use your 2nd level rogue talent to get weapon training in order to have weapon focus pre-req met in time for level 3.
I don't know of any rogue archetypes that would be especially effective here. There is a sniper slayer archetype that might possibly work.
The thug rogue archetype is your basic intimidating archetype for the rogue. It works most naturally with a sap or saps and use of feats like enforcer and maybe sap adept/master, but you can certainly use other weapons or tactics.
It might even be possible to use darts with a ranged feint build or the false opening feat, but this won't allow you any intimidate-related feats for a long time.
On a face book group I was asking for advice for a build that focuses on Intimidate but can actually fight. And have other stuff going for it
How ever I know some of the advice given is wrong.
Such as my rogue going Dazzling Display at level 3 when that feat needs
Weapon Focus and that needs a baby of 1The idea is to take the underhanded rogue Talents and use darts
I am actually not sure if it'll work
I think antagonize was talked about and shatter Defense
I like the idea of throw darts but not sure if its worth it
Also if this works what rogue archetype should I take if any?
My best advice is not to be too ambitious with UnRogue builds. Try to build to the campaign, rather than a complex set of connected talents.