How do the Yautja conduct their hunts?

Hey Predator fans,

So...I've been watching and re-watching the Predator films (particularly Predator, Predator 2 & Predators) and I've been curious to know something about the Yautja.

How exactly do they conduct their safaris for its warriors? Like, who is in charge of the expeditions (particularly for the Young Bloods), how do they decide what makes for a good hunting ground (besides just a place with warm or hot climate) and so forth?

Also (and this is something that I've been tinkering with as a theory), do the Yautja research any human targets who have survived their hunts, make a database for that target on their homeworld Yautja Prime and then at some point, would they send another one of their elites to try and take a 'shot' at that target again to see if they've still got what it takes to survive a hunt against one of their people?

Or if a particular human manages to defeat one of their own in personal combat (like Dutch or Harrigan did), would they just declare that human a 'worthy adversary' and leave them alone, as well as caution other hunters and warriors on their world to not mess with that adversary because they'd be declared too dangerous after stomping out one of their hunters?