Distant war effects

Hi,

I’m just wondering how I can make distant war effects, as seen like below:https://youtube.com/watch?v=q9UDn3VvlF8
The shooting bullets across the skies, flashing lights, smoke funnels etc.

I’ve tried looking up tutorials etc of how to do it and make it look good from a distance, but to no avail. If anyone knows any I’ve missed or can help with a certain part that’d be great.

Thanks