Developing a Sanderson-style magic system?

[Aurimus_]

So I am trying to build a hanfdul of worlds similar to the kind of worlds we'd find in the cosmere, and i'm struggling to come up with any magic systems with that level of inginuity. I know there are 3 parts to every sanderson system, but cannot remember them properly (something like: fuel, intent and focus?). Has anyone got any advice for making them more creative?

So far, I have one magic system based around soldiers in a war (in the same way that allomancy is based around a thieving gang) but have yet to come up with the abilities. I am playing around with a few numbers that could be important to the world, but dont just want to copy the KR. The source is a fruit that grows along the lines of power on the world. 

Another magic system I'm working on is based on a familiar system, where a large cat will willingly give up their tooth to one of the humans to create a bond between them. However I have no idea what kind of ability or story to craft out of this.

On top of all this, what advice in general would other fans of Sanderson's magic systems give to someone aiming to create something similar? How should I come up with such specific abilities (my mind keeps going back to Ironpulling and Steelpushing. It's really clever and I have no idea how to come up with something like that.) Thank you all