I killed everyone help [duplicate]
Solution 1:
This is kind of a two parter question. The first is already answered here. The second:
Sadly, named NPCs do not respawn. Unnamed NPCS (like Guards) do respawn after a few days.
There's something else of note:
Clearing a bounty doesn't make people like you, each NPC has a hidden "affection" value towards the player, which can be decreased by them witnessing/being victims of crimes commited by the player, but increased by side quests. Not all NPCs offer side quests.
Not having a bounty stops people (mainly guards) from attacking you on sight