The Saga of Swamp Thing: #37-40 & #44-50 - These issues are John's first appearance in comics and serves as a good introduction to his character and his relationship with characters like Swamp Thing and Zatanna. This story also shows the first appearance of the Justice League Dark (not by name) as a team up of John, Zatanna, Swamp-Thing, Deadman, Etrigan the Demon, and more.
John Constantine: Hellblazer Volume 1: Original Sin - If you want to get into the character, I recommend reading the Hellblazer series starting with Volume 1: Original Sin. It really shows you what the series is like and also includes John Constantine facing off against an evil demon and showing a glimpse of his time in a mental institution.
Justice League Dark - If you want to read comics featuring John Constantine interact with other DC characters then you should read this series. It features John as a member of a team that has him and other DC supernatural characters like Zatanna and Deadman defending the world from evil supernatural beings.
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