Because you must use peer-reviewed articles, your focus will most likely be on studies which have been done. There are likely studies which demonstrate what demonstrable gains can be made in business through use of appropriate types of advertising. You may wish to discuss, first of all, what types of advertising are available, and then how much and in what ways a business will gain from employing them. Search JSTOR or another database for articles using search terms like "advertising business increase profits" or "business advertising gains" and so forth. I'd suggest doing preliminary research before deciding on your thesis, to make sure that you will have enough material. Once you do, write your thesis statement (the basic premise of the paper) and then make an outline of the major points you want to make which will support your thesis.
I hope this helps you get started!