First of all I think we should only get 3 phases, becouse more than that would mean that the actors would be too old and I don't want to change them in the same universe. Ok, now let's begin. The video games aren't canon for me.
I think Thor 2 will invole Enchantress and Executioner in some way (Leading to A2) and a post credit scene about Malekith working for Surtur.
CATWS would hve WS disapearing in the middle and Zemo as the main villain, WS will then help Cap and disapper again. Post credit scene Amora and Zemo rescuing Abomination.
GOTG, Miss Marvel origin-Thanos, Ms Marvel going back to Earth, Destruction of the Nova Corps post credit scene.
A2 will be called Rise of the Masters of Evil and the Maximoff twins will be part of them and will reform by the end of the film. The MOE will be looking for the Infinity Gems
Post Credit Scene: Pym creating Ultron.
Ant Man would be an introduction to him and Wasp and would have MODOK and Whirldwind as the villains(only problem is that AIM has alredy been in IM3), Post credit Scene would be a funny scene between Hank and Tony.
Thor 3: Ragnarok (Surtur-Beta Ray Bill) post credit scene Thanos stealing the
Infinity Guauntlet.
Doctor Strange: Origin, Mordo, Dormamu post credit scene.
Black Panther: Origin. Post credit scene, Namor declaring war to the surface.
Hulk: Gamma Word Leader, UFoes. Post credit scene Kang saying that to save his future he would need to conquest.
I know that you will say that there are lots of loose ends but gonna meke sense just keep reading.
Anihilation (Anihilus-GotG-Nova-Galactus-Silver Surfer)
Defenders: (Hulk, Dr Strange, Black Panther, Silver Surfer, Namor)}
Wakanda-Atlantis War, Dormamu invasion
And finally:
Avengers 3 part 1:
Kang invasion-Ultron
Avengers 3 part 2:
Thanos vs Everyone
Post credit scene:
The Illuminati (Black Panther, Strange, Tony, Hank, Fury, Namor) assemble and flashback everything.