Like a fair number of other OSR bloggers I tend to eschew the latest memes.
20 Questions are quite good so here are my answers and good show Brendan.
Ability scores generation method?
#1 4d6 drop low with option for rerolling lousy characters
#2 Set stats to class minimums than roll 4d6 drop lowest in order, use roll only if higher.
How are death and dying handled?
KO's at 0, dead at -con
What about raising the dead?
How are replacement PCs handled?
Worked in as appropriate
Initiative: individual, group, or something else?
Are there critical hits and fumbles? How do they work?
Nope. However a 1 always misses and a 20 always hits.
Do I get any benefits for wearing a helmet?
Can I hurt my friends if I fire into melee or do something similarly silly?
Only if you miss in which case compare your to hit roll -4 vs friends AC to see if you hit.
Will we need to run from some encounters, or will we be able to kill everything?
Run. Run. Run Away or sneak when you can.
Level-draining monsters: yes or no?
Nope. I prefer 3e methods
Are there going to be cases where a failed save results in PC death?
How strictly are encumbrance & resources tracked?
Somewhat Strictly in D&D . Its part of the fun. In other games, not much at all.
What's required when my PC gains a level? Training? Do I get new spells automatically? Can it happen in the middle of an adventure, or do I have to wait for down time?
Happens automatically during downtime. This includes automatic spells as well.
What do I get experience for?
Facing Challenges and Spending Loot.
How are traps located? Description, dice rolling, or some combination?
Are retainers encouraged and how does morale work?
Up to the players. Usually BtB.
How do I identify magic items?
Wizards get this as a class ability as do Clerical types for "holy" items
Can I buy magic items? Oh, come on: how about just potions?
This depends on the game. Usually in Auld Skool I make them work for it . Potions and one use items can be bought however.
Can I create magic items? When and how?
Spellcasters can create items in downtime. What they can create will depend on their level.
What about splitting the party?
Sure. I am pretty good at managing this if I do say so myself.