McMMO is a progressive leveling system where players gain XP to level up in various skills such as mining, woodcutting, and herbalism. You unlock new skills with higher levels, and there are even 2 child skills that gain levels from other skills! Mining: Special ability is Super Breaker. It adds 5 levels of efficiency to your pickaxe for a few seconds. It also has the ability Blast Mining where once you have enough levels, you can shift right click TNT with flint and steel from far away to explode it.
If you could explain this with each skill, advantages in what skill and what the plugin is mostly about that would be fantastic, I ain't really that informed on mcMMO, If you're willing to make a guide about that it would help tons, this is more of a suggestion for a thread, however, I like the idea you were going with!
I mean it is the thought that counts. But try to expand it a bit, so we can know how to earn some of the McMMO, because I need that guide the most here, to be honest.