Hi Venkat,
I am very Glad that this issue is resolved.
For creating the gerber file you need to create the layout first, then create artwork, then in the layout or artwork window go to the File menu and select Export.
A dialog box will come and give you some options to select the type of output file you want to create and also the destination path for that file.
Amongst the options for output file type , there is a choice “Gerber”, select Gerber and browse your destination towhat you want and it will give you another window with name Gerber.
Here you can setup your gerber file to be created.
Enjoy, and don’t forget to press Helped me botton!!!
Mehdi