I had the Secret of Monkey Island on a CDROM as a kid and the soundtrack of the original is burned deep into my brain.
Fun fact: you could put the game CD into a normal CD player, skip track 1 (The data track) and just vibe listening to the entire soundtrack while rollerblading.
Instead of trying to specifically carve out spaces for each one, try just figuring out the balance of the starting play area and immediate neighboring regions. Then have rough ideas of where some other continents in the world are, and as other spieces come up that are rare for the region you can say they are originally from continent X.
Until the players actually go visit these other places, you don't need to have societies fully formed and figured out. Once players decide to visit, you should have at least one session of sea/air/whatever travel buffer to give you time to populate new lands (and can then adjust for any storyline/player interest.)
For example, in my campaign I told my players that the elven homeland was in the continent to the south. Three years later they are finally going to visit there, and it turns out I now know that the elders and majority of elves in the capital city live in a giant treetop metropolis while halflings and some other races are engaged in a 1920s style drug-fueled gang warfare on the ground level amidst a technological revolution (Drive-by violence is much more interesting with repeating crossbows and fireballs instead of tommy guns and bombs). The elves care very little about what the "dirty ground races" are up to because as a consequence of their longevity, they are very slow to change and adapt to a changing world.
Had I tried to figure out their society at the start of the campaign, it would have been nothing like that.
There's no other system that quite captures the feeling of, "Shit, that was a lot of damage. Do I try to heal them before it rolls to 0 or just spam attack and hope to end combat before they go down?"
I agree, throwing enemies into stacks is much more amusing than everyone just standing around.
If you have a VR headset then you don't have to wait! https://store.steampowered.com/app/763790/TrainerVR/
Unrelated, but if you do have a VR headset (Or get one) make sure to check out Walkabout Mini Golf!
100% this. The most important thing in my opinion is to to make a good-faith effort to get an accurate ruling (steps 1 & 2) but barring that just make a quick ruling that won't slow the game down and move on with the fight. Keeping the game moving along is an important role of the DM, and no player enjoys sitting there while two other people debate the minutiae of a potential ruling. It's happened to me a few times where I've started a session with the players saying "Last session X happened, but it turns out Y should have happened. X will still stand as happenex, but in the future it will be handled as Y."
If you want the full comfy chillax experience, add the mod that just lets you pause time whenever you want. Feel like fishing but don't want to miss something? Take a pause and relax with a rod for a bit.
I also suffer from min/max gaming and this is the only way I could enjoy the game without being stressed.