Lots of books, here's a way to enjoy them! Just my suggestion, I found this to be a great way to get into the overall Cosmere.
- Mistborn Trilogy 1
- The Final Empire
- The Well of Ascension
- The Hero of Ages
- Elantris (This is one of his first books, it has a noticabley different style, but the story is fun and has some Cosmere stuff for later)
- The Emporer's Soul: Elantris Novella
- Stormlight Archive #1 : The Way of Kings