The Elder Scrolls IV: Oblivion Guide - The Basics, Character Creation
A class is composed of seven major skills, two favoured attributes, and a specialization. After the tutorial, you can choose a predefined class or create your own custom class. The seven major skills chosen will determine how your character levels up. By using these skills and levelling them up, your character will gain levels. The two attributes set as favoured attributes receive a 5 bonus. There are three specializations: Combat, Magic, and Stealth. Each skill in the category selected gains a 10 bonus.