Grondoth

As a long time D&D player, DM, and shameless single player cheater, I've got lots of ideas for mods. But I can't find... anything about how to do it. The basics of "unzip these" are there, but its very difficult to learn anything else. How can you change a self-only spell to a ranged one? How can you change passives? Could you make Blade Ward tick up the Abjurer's Arcane Ward? How do you change armor visuals? I don't know any of that and I can't find where to ask. Does... anyone know?