Level  1 d&d game.
Books allowed: Complete and core, all others ask first and I might allow. No ToB. Running pathfinder fighters
Game will start in a small village of maybe 63 people. You’ve been self training your classes and just achived level  1. To take a new class or a prc you need to train in the arts of said class at a guild or under a master. To learn a feat you have to train for a certain time under a guild or someone who knows that feat. If someone else in the party knows the feat they can train you. Some feats and classes do not need training(see below). 
You can space training out between a longer span of time like half a week training in a class then a week doing something else, then back to training.
The game will focus less on fighting and more on creative problem solving. I will be throwing monsters you can not beat in combat (At least not easily) so you will have to find other was of dealing with them. And remember, if all else fails, RUN!
Training feats will be 1 day under someone who is a professional trainer or 2 days under someone who knows the feat.
First rank in a skill requires half a day of training. Afterwards it just goes up naturally. Skills with synergy bonuses can be taken naturally as well.
Move silently and hide are combined to stealth.
The 8 main base classes will be easily trainable in. Other classes you will have to seek out the trainers. You won’t have to train in classes closely related to your class (Example clerics to paladin) but you might need to seek out aproval from the classes group (In the case of clerics and paladins if you want to be a cleric and or paladin of a certain god)
Prcs will take small quests and or Journys to out of the way places. You will not know where to find all prcs or base classes at the start so ask around and or wait till the chance comes up.