I listened to the audio books and thought it was great fun. You can start with the last wish, which is the collection of short stories that the first Netflix series butchered. I knew who geralt and yen were from the games, so really enjoyed the story of how they met. The stories are quite scattered world building though, so if you're not in the mood for that you could jump straight to Sword of Destiny.

I thought I was getting myself into some serious high fantasy type thing with this series, but it felt more like a Polish medieval die hard movie, and I enjoyed it thoroughly.