Can you say "cock fight"?
But they are getting only pullets

Tho females can fight just as viciously as males.
Just starting off, built my coop and now I’m getting a bunch of juvenile hens from different people, do I just throw them all in the coop and say get along?
Thx for the help !
Aside from the pest and disease risks.....
Could be great....could be a total disaster.
Putting them all in a 'new to them all' environment all at once might avoid some of the territoriality aspects of integration...or not.
How many birds in how much space, in coop and run(in feet by feet)?
Here's some basic integration tips....ignore the separation aspect in your instance.
Integration Basics:
It's all about territory and resources(space/food/water).
Existing birds will almost always attack new ones to defend their resources.
Understanding chicken behaviors is essential to integrating new birds into your flock.
Confine new birds within sight but physically segregated from older/existing birds for several weeks, so they can see and get used to each other but not physically interact.
In adjacent runs, spread scratch grains along the dividing mesh, best if mesh is just big enough for birds to stick their head thru, so they get used to eating together.
The more space, the better. Birds will peck to establish dominance, the pecked bird needs space to get away. As long as there's no copious blood drawn and/or new bird is not trapped/pinned down and beaten unmercilessly, let them work it out. Every time you interfere or remove new birds, they'll have to start the pecking order thing all over again.
Multiple feed/water stations. Dominance issues are most often carried out over sustenance, more stations lessens the frequency of that issue.
Places for the new birds to hide 'out of line of sight'(but not a dead end trap) and/or up and away from any bully birds. Roosts, pallets or boards leaned up against walls or up on concrete blocks, old chairs tables, branches, logs, stumps out in the run can
really help. Lots of diversion and places to 'hide' instead of bare wide open run.