"Analyzing the reasons for any retail company to choose a Business model and the factors associated to make it successful".
I think it should have this for a title:
Analyzing the Factors that Should Influence any Retail Company's Choice of a Business Model
Well, like Ershad implied, we can't help with the structure until you paste it here. Also, your school may have particular requirements.
This seems like a very broad topic. you might have to focus on a particular model or a particular PRINCIPLE that should be applied while choosing a model.
You could compare two models.
I suspect that you are having trouble writing the proposal because you do not know how to construct a research proposal. Often, the good way to do it is to use these headings:
Introduction
Statement of Problem
Research Questions
Hypothesis
Limitations...
Do these sound familiar to you? Google this:
how to write a research proposal
I look forward to helping!