That is a very open question which is probably why there is no response yet, my best answer would be: by learning how te create a campaing. I don't own the Eberron source book but if this gives no guidance I would recommend either buying a DM guide or searching youtube "how to create a campaing 5e"
So i bought the source book Eberron the last war how do i set it to show me the storyline, encounters and stuff of the such.
That is a very open question which is probably why there is no response yet, my best answer would be: by learning how te create a campaing. I don't own the Eberron source book but if this gives no guidance I would recommend either buying a DM guide or searching youtube "how to create a campaing 5e"
Kr,
Rob.
This link should provide what you want:
https://www.dndbeyond.com/sources/erftlw
I ended up finding what i was looking for thank you Jesse and Rob