Living Room Furniture Sets

How much walking space/clearance do I need when laying out living room furniture?
We are moving into a new, unfurnished house — it’s a big blank slate! I am excited about decorating everything, but I don’t want to cram too much into the space and make it feel small. What’s a good clearance around furniture, so that it doesn’t make for a cramped waking flow through seating areas?
Specifically, how much space should there between a coffee table and the couch? And how much space should be between a built-in wall unit and a couch that sits perpendicular to it? The doors on it are 12″, so I’d need at least 12″ to allow the doors to open; I don’t think just 12″ is enough, but is 20″ too much?
TIA to everyone!

I ordered a two piece living room set which conisists of a Sofabed & a Loveseat(which is actually two recliners that are joined together). Anyway the delivery men will only have to carry the items up one flight of steps. Also they will have to put the furniture together once they arrive.