@blooddarkness In addition to the Hack’n’Plan stuff @jgonzalez mentioned, I’ve picked up a bunch of sample design docs as well as a podcast-with-slides by Damion Schubert of Bioware (Austin) on the subject of game design over the years. Schubert’s material is about 10 years old, but it’s somewhere to start.
I’ve got a public onedrive folder with the docs in it at: https://1drv.ms/f/s!AkIOVvCmaOXMhdobSxryC1FZXJkuGQ
Feel free to browse and download what you’d like.
Note: the slides are available as both a PPT and a PDF file, so you should be able to open at least one of them.