I am not an autarch, but I have answers to both of them:
nope! get out those torches. this is a fairly important distinction because having to carry around torches limits your ability to get the drop on enemies in the dungeon, so if demihumans had dark or infravision they would have a massive advantage over humans. Don’t worry, they still have some pretty great perks.
2)the way retreating works is it must be declared at the beginning of the round, before anyone rolls initiative. You can declare a fighting withdrawal or a full retreat
If you declare a fighting withdrawal, you walk backwards directly away tfrom the foe engaged with you at half speed. This has to be done through a clear path (so nobody can be directly behind you). If a foe closes in on you after you’ve backed away, you get to attack them.
If you declare a full retreat, anyone attacking you this round gets +2 to hit you and can use backstabs, and you don’t benefit from a shield because you’re in the process of turning and running, but you get your full movement and don’t need a clear path.
In either case, none of your foes get “extra” attacks on you, they only get the attack they’re normally entitled to on their own initiative count. There are no “attacks of opportunity”.