Questions On Worldbuilding

Heya folks. I've finished all of Homestuck recently (hence the spoiler tag so we can openly talk about anything freely) and due to how my brain works, I've been starting to think up ideas for a possible MSPFA that could be fun to do. Only problem is— when it comes to Classpecting, the moons, and The Lands of X and X, I have absolutely no fucking clue where the organization is.

Started reading Meat And Candy— half way through candy I'm getting nothing— I keep seeing three different takes on what the hell dream bubbles are and ultimately I'm getting VERY confused.

I would absolutely love love LOVE to start something! I think it'd be really good for me! But also, I need to know how to work within this world, or at least what BASELINE rules to follow, before I make something up and get called a huge jackass for putting someone in a moon they shouldnt have been put in. Help a dude bro out?