Umit,
You have not told us which days of the week you are planning to visit Bangkok...

But here is updated information for the famous weekend market: There are not four thousand stalls in Chatuchak weekend market. There are ten to fifteen thousand stalls. And there are two hundred thousand shoppers. The market is divided into sections. You may want to begin in the Antiques section.

Here is a video:

https://www.youtube.com/watch?v=zBXeLOquZXM

Just Fred