I would recommend to read what you want because like nobody has ever read all Marvel Comics. Its nearly Impossible and very very very expensive. Especially the First Comics ever published are not that good and you would propably lose interest. So just Pick a character/ group that you want to read about and There you can try to read everything. I Just read what I want to read and what I like. Everything is just to much.

Not possible, compadre.

Dude, even if it's possible, you don't want to read every comic: 1-there is a large number of bad comics. 2-it's expensive.

And if you continue on your journey of reading every comic then I say good luck to you.

Comic Book Herald is the best guide imo. Just select Marvel from the menu and you're all set (mostly).

Also check the youtube page CosmicComics for all the classic Marvel Cosmic stories.

You can read some Epic collections or Marvel Masterworks which compile 10-20 old comic issues. After that you basically get the gist.