Reddit mentions of Infinity War

The comics are NOT like the movies. We don't have a script for the MCU Infinity War so we have no idea which comics it will borrow from. If past MCU movies are any indication, it will borrow from many different series spanning decades.

That said, there is a very popular 90's event(s) called Infinity Gauntlet that was followed up by the Infinity War:

[optional] Infinity Gauntlet/War Prelude:

• Captain Marvel | Starlin, Englehart, Friedrich, Gerber
  
• Warlock | Jim Starlin
  
• Avengers vs. Thanos | Starlin, Englehart, Friedrich, Gerber
  
  Infinity Gauntlet/War (1990-1992):
  
  
• Rebirth of Thanos (Thanos Quest) | Jim Starlin
  
• Infinity Gauntlet | Jim Starlin
  
• Infinity Gauntlet Aftermath | Marz, Thomas, Starlin, et al.
  
• Infinity War | Jim Starlin
  
• Infinity War Aftermath | Jim Starlin & Mark Gruenwald
  
  Modern Thanos-related comic recommendations:
  
  
• Redemption | Starlin & Giffen
  
• Annihilation | Abnett, Lanning, Giffen (read the whole Cosmic Saga if possible)
  
• Thanos Imperative | Abnett, Lanning, Sepulvida
  
• Thanos Rising | Jason Aaron
  
• Infinity | Jonathan Hickman (read the whole Hickman Saga if possible)
  
• A God Up There Listening | Williams & Starlin
  
• Deadpool vs. Thanos | Tim Seeley
  
• Infinity Revelation | Jim Starlin
  
• Infinity Relativity | Jim Starlin
  
• Infinity Finale | Jim Starlin
  
  

For more Thanos, you can read his origin in Thanos Rising. After the events of Infinity Gauntlet, you can check out Infinity War, Infinity Crusade, Thanos: Redemption, and the recently released Thanos: The Infinity Revelation.

You'll want to read Silver Surfer: Rebirth of Thanos and then The Infinity Gauntlet. You can continue the Infinity Saga after that which is Infinity War and then Infinity Crusade Vol. 1 and 2 but the important part is all in the first two TPBs that I linked.

I don't think that's true.

Welcome, friend! Let's see what you can like...

> Infinity Gauntlet/Infinity War

Infinity Gauntlet

Infinity War

> Civil War

Civil War

> Thor

Walter Simonson's Thor vol 1

Walter Simonson's Thor vol 2

Walter Simonson's Thor vol 3

Walter Simonson's Thor vol 4

Walter Simonson's Thor vol 5

Fear Itself

Jason Aaron's Thor: God of Thunder vol 1

Jason Aaron's Thor: God of Thunder vol 2

Jason Aaron's Thor: God of Thunder vol 3

Jason Aaron's Thor: God of Thunder vol 4

Without going into too much detail: Infinity Gauntlet followed by Infinity War.

Civil War (as for tie-ins, I recommend Spider-Man and Front Line )

Someone else will have to give you more info on Thor. There's Thor: Ragnarok but I don't know much about it

• Marvel Masterworks: Captain Marvel Volume Three
  
• Marvel Masterworks: Warlock
  
• Warlock by Jim Starlin (same as above, but paperback and not $100)
  
• The Death of Captain Marvel
  
• Infinity Gauntlet Omnibus
  
  From here on out, it's mostly paperback.
  
  
• Infinity Gauntlet Aftermath
  
• Infinity War
  
• Warlock and the Infinity Watch #11-17, Silver Surfer: Homecoming & Silver Surfer/Warlock: Resurrection #1-4 uncollected
  
• Infinity Crusade, Volume One
  
• Infinity Crusade, Volume Two
  
• Thor: Blood & Thunder
  
• Warlock and the Infinity Watch #26-31 uncollected
  
• Infinity Abyss
  
• Marvel Universe: The End HC
  
• Thanos: Redemption
  
  This is where the Abnett/Lanning run starts, with the Drax mini leading into Annihilation. After their last bit, Annihilators: Earthfall, you can move to Hickman's Avengers / Infinity arc, along with Jason Aaron's Thanos Rising mini-series. The Guardians team moves into Bendis' Avengers Assemble and then their next eponymous ongoing, also by Bendis.
  
  
• Thanos Annual #1 (Collected with Rob Williams' A God Up There Listening HC)
  
• Thanos: The Infinity Revelation HC
  
• Hulk vs. Thanos mini-series, forthcoming