Samrat,
Good to know that you have bought a Canon 500mm f4.

You can buy a manfrotto monopod plus this manfrotto 393 gimbal (http://www.bhphotovideo.com/c/produc...ty_Gimbal.html). You need to check with manfrotto india or a local dealer. I am giving links to B&H in US so that you can get idea about the details of the products. In India the manfrotto 393 head costs 12,857/- (http://www.amazon.in/Manfrotto-393-H...=Manfrotto+393 )

The above would be perhaps the cheapest option.

An expensive one, which I have, is the Wimberly WH200. That would be a lot costlier. There are cheaper Benro gimbals, knock offs of Wimberly design, which costs about 25-30k in India. The Wimberly WH200 costs 595 USD. In India it costs about 57k.