Problem with proper drawing size in autocad

I've got a problem with proper drawing size. I don't know why the
application creates the drawing with the following dimensions: height:
167959 and width: 333686 - How can I change the settings to obtain the
following parameters: for example: height 385 and width: 486? I am a new
user of AutoCad, so I need your understanding. Below I have attached a
screen that illustrates my problem.

http://www.chandler.pl/autocad.jpg

 

I think you're really talking about "limits" rather than "drawing size",
which has no meaning in acad-speak. Look up "limits" in the help.

Limits are controlled by the LIMITS command, and if you are getting the same
limits on all your drawings it is probably coming from your default drawing
template. Change it in the template to what you want and every *new* drawing
will be the same. In drawings *already created*, use the LIMITS command to
change them to what you want, or, if there are too many to change manually,
create a script to do it for you.

I'm no expert on scripts, but someone else might be able to advise on that.

 

[delete]

Thank you very much!