I read that a good way to use LLPSI is by memorizing lists of words before going to the text. Does anyone know where these word list are?
The best list to memorize before reading each chapter of LLPSI is this:
Seriously, you heard wrong. The whole point of Lingua Latina Per Se Illustrata is to learn each word from context. It's called "the natural method" because it teaches Latin the way you learn your native language (just faster and more streamlined): from context, always from context, without translating, not even in your mind. Try it! You'll like it. It's easy. It's fun, even.
If you really want to memorize word lists,* you might consider a different text, one that's designed for that approach.
* Does anyone really want to memorize word lists??