I ' ve run 2 APs , first thing I ' d say is for you to expect them to run longer than 20 sessions , when I run them they go on for 6 to 8 sessions per chapter , 6 chapters per AP . The usual structure will be background information alongside combat , so most RP will have to be handled by he GM . If you go to paizo . com you can find a list plus some description of the campaign and you can download the player ' s guide for free so you can see some more info . Also I ' d say to start looking from Council of Thieves which is where they started with full on Pathfinder rules on these before that they were 3 . 5 rules though Rise of the Runelords and Curse of the Crimson Throne just got remastered to Pathfinder rules . I haven ' t actually run it but Council of Thieves might be just up your group ' s alley . If the 20 sessions is what your are looking at , maybe make an ad hoc campaign based on a collection of modules .