Need help setting up an ability system

[Vernadain]

Hi all, im currently trying to set up a 1.20.1 minecraft mod where different players have characteristcs that influence their access to abilities.
Think electroblob, except, rather than opening a menu to bind abilities to your wand, you open a menu to bind abilities to your player. you can then cycle between abilities using z/x (whatever hotkey) and utilize it through r.

I've currently set up a system to attach a "type" characteristic that influences what type of abilities you can access and a "level" characteristic that influences other aspects.

However, im struggling to figure out a way to make it so when you open up the menu, you have only certain abilities displayed (depending on type and level) and 9 slot buttons that you can click to put the abilities you want on said slot. 
I've been looking at electroblob's but im kind of lost because of how big it is

TLDR:
I have:
"Type" and "Level" characteristics that can be changed and apply on the player
I have a rudimentary menu that opens and displays the player's type and level

I need:
A way to create a dynamic ability selection - ability slot mechanism that opens alongside this menu.
A way use abilities placed in whatever slot you have.

I dont really expect a straight up answer but any tips or videos would be helpful!
Im just really lost on how to implement my ability system, ive been scouring a lot of mods but all of these ones ive found so far that apply abilities to slots that are attached to the player have been made through mccreator and i dont know how to read those codes. If you need an idea for what im asking, you can check out this mod called Sequence Pathways (LOTM), i want something like that system (but its through mccreator)

Again, tips or vids or guides or something would be helpful to do something like sequence pathways or electroblob

Edited August 5 by Vernadain
Made more specific