I want to start PHD degree program free of cost

NOT going to happen.

ANY PhD program has a significant cost associated with it.

Well you won't get anything for free. But yes you can opt for online degree programs which cost lesser than full-time programs and at the same time makes it flexible for you to get a job to support yourself. There are really good and well accredited online colleges that provide online degree programs in IT, Business Information Systems (http://www.thebestdegrees.org/online-degrees/business-information-systems/) etc.