Sign up to the Fortnite Island Creator & Engagement Program to publish islands and have the chance to receive engagement payouts.
Publishing from the Creator Portal
Fortnite Island Creator & Engagement Program: All Details
How to set up a Fortnite Creator Portal: A step-by-step guide
Epic revamps Fortnite monetisation, giving creators 40% of net revenue
Fortnite Creator Portal
Engagement Program Payout Terms, PDF, Indemnity
Setting Up Your Profile Epic Developer Community
Publishing your UEFN project to Fortnite - Releasing Our First Fortnite UEFN Island — Chris McCole
Support-a-creator vs Island Creator (Creator Codes) : r/FortniteCreative
How To Earn MONEY in Fortnite!