Dear Neelakshi,
Congrats on your new assignment. Kindly search the following posts too, as we haev earlier discussed on setting up of a new HR department. You will find good material here:
https://www.citehr.com/152990-new-jo...r-manager.html
https://www.citehr.com/154268-new-joining-h-r.html
Apart from what is mentioned above, please have the following in mind too before initiating the work:
Since its right from the scratch, please set the proper standards for each HR processes. Example - For recruitment.
Once you have understood the Recruitment needs, perpare a standardized "New Requirement form" to be sent to all department heads. When ever a department feels that they have to hire a new person, they have to fill that document and send it across to you - and all recruitments should happen only through the HR department and not by the individual department.
I am highlighting the above, because I am also facing the same situation as yours. I am the first HR here... and I made the mistake of not communicating these standards to other departments. One fine Sunday, my dad showed me a newspaper ad that had a posting from my company, for a new position - and the HR is knowing abt it from the newspaper!
So as I mentioned earlier, after you go through the above posts, kindly definethe standards for each process, and communicate it to teh other dept too (ofcourse with teh consent of your boss :-)
Good Luck!!!