Power Analysis- Help

Hey all, this is the first time I am initiating a thread and it’s nice to know that there are other people sharing similar difficulties. So, I’ll get to the point. I am having some difficulties getting my head around statistics and methodology.

I have read a lot of books and decided on my methods but the road-block is choosing the appropriate statistical test and the sample size. I am thinking about conducting survey with simple random method and then do regression analysis as it would be most suitable as per my research. But how do I do the power analysis and choose the sample size? How to I justify it? It’s really confusing to me.