There's a "greatest hits" collection (for lack of a better word) on (IIRC) Rhino called Strictly Commercial. That's how I started our son on FZ; he now has a huge collection (and there is plenty out there).
I would suggest Joe's Garage Act I and Sheik Yerbouti, then possibly Apostrophe.
If you listen to Jazz I would start with Hot Rats.
If you listen to rock start with Overnight Sensation.
Good stuff.
200 Motels (hard to come by)