Writing an abstract is a good idea for all of your writing projects since it makes you focus on what is important in your paper/project. It also provides a powerful way of reevaluating your logic and in defining your purpose. An abstract can be extremely helpful in your writing process if you are stuck or blocked.
You will notice that abstract/proposal requirements differ for each professor and conference.
Your proposal is to be 300-500 words or about 1 page