[1.21.1]New to Modding and Coding, Need guidance for making a skill/ability based mod!

[SylverDread]

As the title says I'm completely new to making minecraft mods but I'm looking to learn and create a mod I've been wanting to be a thing forever.

I'm obviously not looking for someone else to make the mod themself but to point me to places where I can learn the necessary skills. As of right now I'm going through Kaupenjoe's tutorial for 1.21.X and have gone through twelve videos so far and finished his Coding for Minecraft and Hytale series. To be transparent I haven't absorbed it all and have gone back to rewatch a few videos three or four times.

Right now I am looking for sources related to these things:

-Creating a "spellbook" with 4-5 abilities able to added

-Creating a custom UI for said "spellbook"

-Kill count triggered events for the "book" unlocking entries

-Creating custom skills and abilities

-Creating unique particle effects

-Tying these spells to keybinds

-Making custom mods able to spawn in the world after certain entries in the "spellbook" are unlocked

My biggest hurdle as of now having been working on this for a month has just been hitting walls trying to find information for these things above with no real answers out there for them. I figured this would be a difficult first endeavor but didn't think finding the info would be the hardest part. I'm also not sure what mods are similar to this except Iron's Spells n' Spellbooks which I'm not sure I can get the code to look at as a reference. 

Everything else I am looking for I believe is covered by Kaupenjoe's tutorial I am currently watching.

Edited Friday at 12:01 AM by SylverDread
Clarifying context