Hello Vishal fabrication is done many a ways. if you have acess to milling machine you download the gerber files from your design and use the station to which the milling machine is connected and mill your board. or the primitive but the effective way is to etch your board using acidic solutions a laser printer.

to get a good understanding of how to etch your printed board(tone transfer method). refer to videos on youtube

Circuit Skills: Circuit Board Etching – YouTube

Like these and i hope you will find them useful.

Regards
Elchiquito