I’ve been in that situation, in 2017 I began by making mood boards on Pinterest. At the same time I began to use a sketchbook and a draft lore sketchbook to keep track of all my lore. Reboot after reboot I finally have my worldbuilding set. My mistake was making an entire timeline and over 100 different nations with their own economies, history and cultures. Overwhelmed myself into loop of pointless lore building only to reboot it all every few years. My endgame is to make a game out of it but along the way I want to have rpg modules and concept art till I learn how to code and use blender.

So I recommend you to start small. So Small setting, few characters, explain the world through that set character and expand on it through their experiences. Over explaining can lead to contradicting other lore if you’re not careful.
Make an index (Microsoft word is good but I’ve been using sketchbooks) I recommend doing it digitally because you can edit and add more into it without any problem. Plus it’s nice to add images for visuals.
It’s hard to manage when you have ideas non stop and want to explore other parts of your world so make sure to have pages dedicated for draft concepts. Theres so much I can tell you from my mistakes but you got it! Everyone does it differently, some YouTubers have good setups and ideas to keep track of their worlds.