>>5253120I mentioned choiceofgames and their interesting approach to attribute design it on the last QTG thread. If you really want gamebooks I recommend Lone Wolf and Project Aon, they were my first introduction to roleplaying games.
https://www.projectaon.org/en/Main/Homehttps://www.projectaon.org/en/Main/BooksThe first Lone Wolf book:
https://www.projectaon.org/en/xhtml/lw/01fftd/tssf.htmI recommend the Grey Star series here (wizard stuff, it is just four books)
https://www.projectaon.org/en/xhtml/gs/01gstw/coming.htmand if you want to cheat and skip the rules, go straight to the adventures:
https://www.projectaon.org/en/xhtml/lw/01fftd/sect1.htmhttps://www.projectaon.org/en/xhtml/gs/01gstw/sect1.htmEverything is free, you can play through all the illustrated adventures online. The author left all his published work to the internet as his legacy to Dungeons and Dragons.