Any one can read a few articles on the internet about how solar panels work and how to setup a system, but I think you really need an engineer to help you setup a system, because he would know how to calculate your exact requirements and to implement a system which fulfills all your future needs as well.

Because the cost of the panels is the major issue here so calculating how much energy you need is of utmost importance.

Large scale solar farms can be setup in Pakistan and can be cost effective as well but we need skilled people to run these facilities.