Can not start GUI using XQuartz and DISPLAY is not set error.

[Jim Jim]

Hi,
I am brand new user in Mac (using OS X) and I need some help. I am using ssh to connect to some linux servers. I am trying to open a GUI locally for a process running in the remote linux server. So I read that I should install XQuartz which is used for the X11 in the Mac.
I installed it but when I try to start the GUI I get error that DISPLAY is not set.
And indeed when I echo DISPLAY, nothing is has been set. Am I supposed to set something manually?
I also noticed that there is some command line as part of the XQuartz installation. Am I supposed to use only this command line?
When I start it and echo DISPLAY I see just :0.0

I am sorry for my basic question but I am stuck on this. Any help please?

Thank you!
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