Ok, this is may be overload for a new person to MCU, but if you really want to get the full picture, this is the chronological watch order for the entire MCU. The first five movies were not released in the MCU timeline order, so thats why Bruce Banner is played by Edward Norton. Ironman is technically the first movie, as it was the first movie to be released, but in timeline order, its the third movie.
Captain America The First Avenger ( spoiler alert, dont watch the mid credits scene)
Agent Carter (interesting to watch, great to fill in the back story but not really necessary)
Captain Marvel ( spoiler alert, dont watch the mid credits scene)
Iron Man
Iron Man 2
The Incredible Hulk
Thor
Avengers Assemble
Iron Man 3
Thor The Dark World
Captain America The Winter Soldier
Agents of Shield Season 1 (interesting to watch, great to fill in the back story but not really necessary)
Guardians of The Galaxy
Guardians of The Galaxy Vol 2
Agents of Shield Season 2 (interesting to watch, great to fill in the back story but not really necessary)
Avengers Age of Ultron
Antman
Agents of Shield Season 3 (interesting to watch, great to fill in the back story but not really necessary)
Captain America Civil War
Doctor Strange
Black Panther
Agents of Shield Season 4 (interesting to watch, great to fill in the back story but not really necessary)
Spider-man Homecoming
Thor Ragnarok
Agents of Shield Season 5 (interesting to watch, great to fill in the back story but not really necessary)
Antman and The Wasp
Avengers Infinity War
Avengers Endgame
WandaVision
The Falcon and The Winter Soldier
The TV series other than Agent Carter and Agents of Shield are not part of the main MCU story line.
Daredevil, Jessica Jones, Luke Cage , The Punisher , Iron Fist and The Defenders are all connected and tell the story of what happens in New York after The Battle of New York in Avengers Assemble.
Runaways, Inhumans and Cloak and Dagger are set in the same world as MCU but they are not connected in any way to the other TV series or the main MCU storyline.