Easily available MOSFET I found out is IRF540 -
This is link is to the datasheet:
http://www.irf.com/product-info/data...ta/irf540n.pdf

Since I am not familier with most of the terms in the datasheet, can you please advise if I can use this Mosfet and If I can use the same circuit?

Also, I need to control lamps upto 100W, which I believe can be done using Heatsink on this Mosfet. Thanks for the help.