Not the greatest Sanderson starting point, but a free book is a free book. There are some minorish spoilers in these books for the first Mistborn trilogy.
https://www.tor.com/2022/08/02/download-brandon-sandersons-the-alloy-of-law-before-august-6/
https://www.tor.com/2022/08/02/download-brandon-sandersons-the-alloy-of-law-before-august-6/