Well according to Wiki:
A von Bek features in the following novels and short stories:
- The War Hound and the World's Pain (1981)
- "Flux" (1979, short story, retroactively rewritten as a von Bek)
- The Brothel in Rosenstrasse (1982)
- The City in the Autumn Stars (1986)
- The Dragon in the Sword (1987, with Erekosė)
- The Sundered Worlds, aka The Blood-Red Game (1965, retroactively rewritten as a von Bek)
- "The Pleasure Garden of Felipe Sagittarius" (1965, short story, retroactively rewritten as a Von Bek)
- "The Cairene Purse" (2002, short story)
- The Dreamthief's Daughter (2001, with Elric)
- The Skrayling Tree (2003, with Elric)
- The White Wolf's Son (2005, with Elric)
I've read War Hound, The Brothel In Rosenstrasse and the Elric tales and enjoyed them all. BTW if you want to know the origins of Elric check out Victor Gollancz's Masterwork edition of
Elric: Stealer Of Souls and Stormbringer.
The first three VonBek stories are The Warhound and the World's Pain, The City in the Autumn Stars and The Pleasure Garden of Felipe Sagittarius, so start with them perhaps. You can get these in an omnibus edition entiled
Von Bek from VG.
VG's Masterwork series has many Elric, Corum etc.. novels/stories worth purchasing BUT try out the VG Masterwork
Dancers At The End Of Time (omnibus 3 novel collection). It's superior to Elric and one of Moorcock's finest works!