The Reputation and Fame mechanics, as written, expect a character to gain about 4-6 prestige points per character level, capped by your Fame score. Each time you gain a fame point, you also gain one prestige point. Those are earned by completing objectives that will help your reputation with a specific group or region.
Prestige Points represent your ability to leverage your Fame. You earn Prestige Points (PP) by completing objectives during the course of play. The GM decides which deeds, goals, or story elements are most important and awards players for completing them accordingly. Each time your Fame increases, you also gain 1 Prestige Point. In a typical campaign, you should gain approximately 4 to 6 Prestige Points per character level. Your current Prestige Points can never exceed your Fame. You can’t share Prestige Points with other characters; only the character who earned them can spend them. Most of the time, you spend points on rewards—titles, temporary abilities, or bonuses on tasks associated with your interests.
The table of Fame Events are examples of what situations would increase your Fame (and award a prestige point), like gaining a level (+1). The GM is free to adjust and create new rewards as necessary.
The book (ultimate campaign) explains how this should be awarded and gives us some examples of what is to be expected for certain amount of prestige points. The various published guilds and schools have additional options that can be awarded to their members.
For example, the Inner Sea Magic presents four schools of magic: Kintargo Opera House (Cheliax), Oenopion Fleshforges (Nex), Poisoner’s Guild (River Kingdoms) and White Grotto (Absalom).