I have a head start on the friendly, neighbourhood bar as the room itself has been decorated for sometime.
This roombox is only 7 1/2" deep so I'm really limited as to what will fit in it. At this point I'm thinking the bar will go on the left hand side with mirror-backed shelving behind it. On the right to the right side of the door, I'll put in one booth that my detective will use as an adjunct to his office. Even with 24" wide tables, I'd need almost 11" of depth for two booths. And there certainly isn't room for a pool table so I'll settle for a dart board at the front of the right hand side.
Even a small bar is going to take up a LOT of room. 1/2 - 3/4" deep shelving against the back wall, at least 3" space between the shelving and the bar, about 2" total depth for the bar itself. That will leave only about 2" for the bar stools.
First the booth. I built two singles and a double using dimensions from the restaurant supply site I mentioned this morning.
Here are the singles as that's all I'll have room for on this project. The seat is a bit low but once it's upholstered, it'll be the right height. The bench backs come in heights of 36", 42" and 48". I went with the highest back for privacy.