Have you already listened to his more well known albums? If not listen to:
- Everything from the 60s
- Burnt Weeny Sandwich
- Weasels Ripped My Flesh
- Over-nite sensation
- Apostrophe (')
- Sheik Yerbouti
- Joe's Garage
If you listened to all that and like it then literally just pick anything and it's guaranteed to be interesting:
https://en.wikipedia.org/wiki/Frank_Zappa_discography