Hai soni,
If u decided to do Ph.d in HR,
1.Choose your field and topic in which you are interested,like T&D,Recruitment etc be specific.
2.Choose your university,in which university you would like to do your Ph.D.
3.Then find the guide, that is the most important thing to pursue Ph.D.
This the first step that you need to do right now. Further guidence will be given by your Ph.D guide itself.
Regards,
Ketzi