How To Use Social Networking For Business

How to evaluate my business idea?
I am planning to launch a social networking site.The business model is to sell online advertising spaces.I have a business plan ready and am considering seeking angel investment money.
The problem is that I can’t decide on the following questions:
1) How much money should I ask? My start up cost is around $150K
2) How much equity do I offer?
3) What are the chances of me getting the fund? If not, what strategies should I use?












