Here are some starting notions.<br/>There will be very few classes- Fighter, Rogue, Adventurer, Sorcerer and Priest - to keep things easy; spells will not be very much but will be widely differentiated.<br/>A little thing about multiclassing: You can multi-class freely (when you take a level, you can take it in any class) BUT when you take the first level in a class AFTER character creation, you won't get the "starting bonus" (eg. starting feats, starting skill points and so on), but the ones corresponding to the taken level. Moreover, all the bonuses listed in the level progression tables are NOT cumulative when you take levels in multiple classes; instead, you take the better scores from your different classes.