Hi
I want to create a different line type accroding to my requirement
whats process

Either you can type in the line-definition codes (.LIN file) manually or you can use the MKLTYPE Express Tools command.

where we can download linetypes?

 
 Not Download but creating a new linetype .
 
 You can see here:http://www.afralisp.net/lisp/ltype.htm
 

There is a couple of AutoCAD linestyles downloadable here on the Downloads page (see the left menu).