how to make my social networking site ?

[J]

As Lalit suggests there is going to be lots of maintenance that needs to be done continually by a team, not just one person.

those social sites are hard coded, not platforms like WordPress or Joomla

your team does not have to be where you are or where it is hosted, research the search engine duckduckgo.com to understand what they have done.

I would think one focused on India or Asia would be a huge success. there are many companies in India that are making great strides in global business eg: Tata Motors, Hero motorcycles

so why not your business