In this tutorial I show two ways to give items to players when the game starts. The first is the simple way through the UI of UEFN and then the second way is to use Verse to grant items to players. The second way to do it is far more versatile in the long run and well worth learning about.
https://dev.epicgames.com/community/learning/tutorials/yyr7/fortnite-simple-programming-in-verse-to-give-items-to-players