The headline says it all.

The game is very extensive ... you can not plan a character without knowing the qualifications of the talents.

We need a manual!

https://www.d20pfsrd.com/

This is also a good resource: http://prd.5footstep.de/

it's good enough. game doesn't deviate too much apart from mob stats and some simplifications like flanking. some domain spells are changed too. with time there will be comprehensive wiki on all that stuff but as of now d20pfsrd.com is best we have. what game actually needs is more info on the UI. there is no tell between 0.5 and 0.75 bab classes in the game, for example. it is also impossible to preview prestige classes until you unlock them. it makes blind play-through a wild guess game on that part.

Here's another one:
https://www.aonprd.com/


A lot of people don't realise this game is based on an actual adventure series.
https://paizo.com/kingmaker
http://pathfinder.wikia.com/wiki/Stolen_Lands