how do i make a system? it looks fun!

I'm in a LOT of fandoms, but I'll list the most important ones: - LEGO: Ninjago - LEGO: Monkie Kid - OMORI - Murder Drones - The Amazing Digital Circus - The Gaslight District - Knights of Guinevere - Deltarune (Hyperfix right now!!) ^ Undertale, too, but less so! - Object Shows (also fixated!) ^ specifically Inanimate Insanity, Battle for Dream Island, Love of the S*n, Object Cringe, The Nightly Manor, Paper Puppets Take 2, Beans Show, BURNER, Tripwire, Animatic Battle, It's Time For The, ORBIT - Dayshift at Freddy's & Dialtown - Arcane & League of Legends - Subnautica & Below Zero - Outer Wilds - Batman: The Telltale Series - Regretevator, PHIGHTING!, Pressure - Adventure Time & Fiona and Cake - The Crane Wives Okay htat's ALOT but I'll probably only really post about one or two most of the time depending on which im fixated on Okay also boundary stuff, I block freely! Even if you're not on this list, I might block you anyways for other reasons! DNI: - Proshippers & Darkshippers - NSFW & MDNI - Transmeds - Radqueer - Younger than 13 - Endogenic systems & supporters - Hazbin Hotel & Helluva Boss fans / Vivziepop supporters (ESPECIALLY selfshippers/kins/etc of the Vs) - TCCOAL fans - Anyone above 21 is on thin ice!! Just dont be weird to me and you'll be fine