In original story the timeline isn't mentioned properly, so we will follow this timeline as the original.
Konoha Year 0: Konoha founded
Konoha Year 26: Minato and his group were born
Konoha Year 32: Kakashi's group were born
Konoha Year 38: World war 3 started
Konoha Year 47: War ended
Konoha Year 50: Naruto was born
This timeline may not be accurate, but I will follow it. The events will follow in the same order as in the story, and change will only occur if our MC does something.