Can't help you much but I recommend you to align yourself with the eac wiki of another cheating site (will get censored if i link it here) (eac is Fortnite's anticheat) :
The wiki has much more important information in the "information" part down below.
Also check this source out: https://www.mpgh.net/forum/showthread.php?t=1332093
Theres also a site about Fortnite Reversal, Structs and Offsets (cant name that site or else get censored lol)
This should help you to get into fortnite hacking more easily just don't give up
Good luck!