Pretty easy to do, just download the custom class editor add-on from Torann, open it up, mine's at C:\Steam\steamapps\workshop\content\294100\2114216280\

He put some pretty straight forward comments in it, so just read through the files, and you should understand. You can find the IDs for the abilities in the rimworld of magic mod, which for me is at
C:\Steam\steamapps\workshop\content\294100\1201382956\Defs\AbilityDefs

Awesome!!

really need to learn how to make one, been wanting to try a mix of enchanters blade enchanting, wanderers multi purpose basic spells, and death knights set with lightning (just to add some range) to make my Lightning Master Knight class :D

OP? Sure, but who cares ^^