I am divorced indian woman earning 15 k at present, how do I make financial planning for retirement & safety?

I am 30 year old divorced indian girl. At present living with my mom and brother. My brother is treating me bad, so I want to be on my own and is planning for safe future so that I do not have to depend on anyone. I have No savings at present. After divorce I started earning again. I am working in private company at present and earning 15k month. I have done masters in commerce with less than 50%. And right now pursuing distance learning mba from sikkim manipal. Though I am looking for second marriage, I do not want to rely on anyone in my life. I want to stand on my own feet and want safe retirement. Can someone suggest how do I handle my finances so that I can buy small home on my own at ahmedabad within next 2-3 years (for my safety as incase if my 15 year old brother get married in future & his wife do not want me at same place) & how much should I invest from my salary to get safe retirement and enough pension during old age. Pls suggest. Pls do not answer like consult financial planner etc. I am asking here so that I can get suggestion here.
@John, its 15000 rupees. I am living in India only.