Ha, you know it’s too obtuse when it baffles ‘Esoteric Knowledge’! That’s the issue with such minimalist restrictions.
This requires 3 different coins - they need to be uniquely identified, so different value coins for instance. The symbols at the top of the table just refer to these 3 different coins with unique, generic icons. One of your coins would correspond to the first icon, another to the second, and so on.
First step: flip all 3 coins. Find the corresponding shapes in the table and combine them however you see fit to make a room.
Second step: flip all 3 coins. Find the corresponding words in the table and use those to determine what’s in the room.
The process is repeated for each passage, which it defines as an offshoot of 2 or more cells.
I hope that makes a bit more sense!