I want to open a bar and clean it up. Where to start the interior decoration? What is the approximate cost?

This one alone won't cost much, about 12 thousand.

The wood floor on the ground has the highest cost performance, low cost, reusable and upgradeable.

It's easy to make a bathroom on the ground, just go into the water where you want to make a bathroom, so it doesn't cost much.

I suggest that if you don't understand these things, you'd better talk to the decoration company about your ideas, and they will know how to do it. I'm afraid if I do it myself, it won't be suitable in the last position.