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!