Hit Die: d8.
The expert can choose any 10 skills to be class skills.
Skill Ranks per Level: 6 + Int modifier.
To add some flavor to your expert, look at Expert Boons.
The following are the class features of the expert NPC class.
Weapon and Armor Proficiency: The expert is proficient in the use of all simple weapons and with light armor, but not with any type of shield.
Pathfinder RPG Core Rulebook. Copyright 2009, Paizo Publishing, LLC; Author: Jason Bulmahn, based on material by Jonathan Tweet, Monte Cook, and Skip Williams.