Excellent thinking, Supriya. What I can suggest further is instead of saying OD, you can be specific that HR plays a strategic role in OD. This is a burning issue nowadays, and HR needs clarity in terms of the role as a "Business Partner" in OD. Good going...
You can start by reading different books on the subject and gaining knowledge of the latest trends in OD. You may divide this into three modes: the situations of yesterday, today, and future trends (requirements). Gather all the necessary data before starting this project. Additionally, look for good companies where OD practices are initiated (in a real sense).
Once you are ready with this, select one company and apply this tool. I hope this is good enough to start with. All the best!
Regards,
Ajay