Here's a small breakdown of how I tackle doing assets, as well as how my scene development process went for my own personal Unreal Engine Basement Scene.
I hope you find it useful.
PS; for higher resolution images, hit the download arrow button. If for some reason it doesn't work, don't hesitate to contact me through private message or to my e-mail at email@example.com and I'll send them over for you.
PPS; Here's also a link to my Google Drive with 3-paged PDF version of this. Hopefully it's easier to read this way for some of you folks. https://drive.google.com/open?id=1b-dh5aAEqW0V8BkHIobuIxtmZ7ygRAjv