Oh boy, I think I've gotten like, 3-5 of my friends hooked(on different levels, some more, some less) on Sanderson.
I started some out with Steelheart, while lending another one WoK as a beginner, going to let another friend read Mistborn Era 1 next year
Personally, now that I've read more, I think I would get people started on Elantris/ Warbreaker(or maybe something out of AU) to get them into Sandersons works.
Then go for Mistborn Era 1, WoK, Secret History, Mistborn Era 2, WoR, probably some of the random Arcanum Unbounded stories between here and there as well, like Sixth of the Dusk and Shadows for Silence.
I haven't gotten my Oathbringer yet, so I'm still waiting to actually finally get that, hopefully this week...