KyoMatsuri

So I'm trying to create my own custom spell for Skyrim, but I also want to create my own effects for it. How exactly would I modify/edit a vanilla effect so I can make it my own custom effect? Please help!!

I'm not trying to modify the original Spellbreaker shield though. I'm trying to implement a brand new shield into the game that just uses Spellbreaker's .nif file and an edited version of its .dds file. This shield is supposed to be a standalone shield, not a modified Spellbreaker.

So I'm trying to make a new shield in the game, based off of Spellbreaker just with a significant boost since it's a fairly weak shield. My main problem is implementing the texture that I have onto the mesh. I've tried a million times with a million programs, but I can't get anything to work... I have the .esp file for the shield, the .dds file of the texture, and I'm fairly certain anyone who's going to help me would have access to the .nif file for Spellbreaker. I pretty much want to make a version of it that seems more "Daedric" and less Dwarven. If someone could help me, I'd greatly appreciate it! Please let me know!