Greg Pak wrote comics featuring the Hulk and/or the Hulk family for five and a half years, starting with the epic "Planet Hulk" saga. Here's the reading order of what's available in the shop at the moment:

Planet Hulk

World War Hulk

World War Hulk: The Incredible Hercules

Skaar Son of Hulk, Vol. 1

Hulk: Planet Skaar