We don't know what you have available outside of India PCPartpicker and thus cannot tell you exact parts to get if your buying from a local market. To get a system that you won't need to upgrade you will want a i5 for CPU, MB that supports that socket, at least 8gb or RAM, 1TB storage as its typically the best storage amount/price, a decent PSU (see list below), and a case of your choice that will support those components. Here is a guide on how to build that system, good luck!
http://www.tomshardware.com/reviews/build-your-own-pc,2601.html
PSU List:
http://www.tomshardware.com/forum/id-2547993/psu-tier-list.html