how to make all players get a random autokit from a certain list after respawn?

It is in the documentation , create a kit and name it for example "First_Kit" , then in the config replace the ExampleKitName with that one, I have cooldowns of 3600s to stop players using them all up at once,  * i  dont remove the otherkitnames line from the kit name and it works with no dramas, you can add as many kits into that section as you like.

Creating Auto-Kits

You can set up auto-kits that are given to players after they respawn. This is done via the config file.

In the config you will see this

"Autokits ordered by priority": [
    "ExampleKitName",
    "OtherKitName"
  ],

Simply add pre-made kit names to this list and they will act as auto-kits.

When a player respawn's the plugin will attempt to give the player each of the kits in this list, but they are still bound by the rules you have set up for the kit besides the Auth Level and the Cost.
"Autokits ordered by priority": [
"ExampleKitName",
"OtherKitName"
],
As soon as 1 of the kits has been successfully given to the player it will stop iterating there.

thanks a lot!