Buying War of Kings

Reading just this War of Kings book, your getting the short edited version.
Read all the crossovers to really appreciate this fantastic story. It would be difficult to list a reading order of everything leading up to War of Kings since this story has been building for years, but you want the main story you should get the books with the War of Kings banner, "Road to War of Kings", "War of Kings", "War of Kings Warriors", "Nova Vol5 War of Kings", "Guardians of the Galaxy Vol 2&3 War of Kings".
For the best experience, read the individual issues in this order:
War of Kings Darkhawk #1 & #2
X-Men Divided We Stand #2
X-Men Kingbreaker #1
War of Kings Warriors #1 (Gladiator/Blastaar)
Guardians of the Galaxy #7 - #10
Secret Invasion: War of Kings
War of Kings Warriors #2 (Crystal)
X-Men Kingbreaker #2 - #4
War of Kings Warriors #2 (Lilandra)
Guardians of the Galaxy #11 - #12
War of Kings #1
Nova #23 - #24
War of Kings #2
War of Kings Savage World of Sakaar (doesn't fit in seamlessly)
War of Kings Ascension #1
Guardians of the Galaxy #13
War of Kings #3
War of kings Ascension #2
Nova #25
Guardians of the Galaxy #14
Nova #26
War of Kings #4
War of Kings Ascension #3
Guardians of the Galaxy #15
War of Kings #5
War of Kings Ascension #4
Nova #27
Guardians of the Galaxy #16
War of Kings #6
Guardians of the Galaxy #17
Nova #28
War of Kings Who Will Rule
Guardians of the Galaxy #18 - #19

Like with all crossovers there is some overlapping, but to avoid spoilers this is the best way to read this epic story.Get more detail about War of Kings.