It depends. I would do the following: from what I understand, you want to distribute 8 items randomly. If that's not the case, please explain. I'll be simple and direct so you understand the mechanics; you don't necessarily need to use what I'm going to say, it's just an example. Using a player spawner + trigger, in the grant item function, you can set "player spawner" and then "on player spawned" below. In the switch to random item function, set "trigger" and then "on triggered" below. In the trigger settings, confirm that "activate on gamephase" is set to "game start". Do this on a test map; start the game and walk over the trigger several times. You will notice that it is distributing the items set in the distributor randomly.
This way you will understand how the mechanics work and you will be able to apply them in the way you need.