A crucial step in the writing process, topic selection merits careful consideration. Methods for identifying topics include reviewing:
Look at recent news articles focused on this area of law to get a sense of which areas of the law are unsettled and which issues practitioners are thinking about.
Looking at the tables of contents in recent issues of the following journals will suggest current topics.
Each of these books include chapters on identifying a topic, developing a thesis statement, polishing and editing your writing, and other helpful subjects as you embark on the academic writing process.
Academic Legal Writing: Law Review Articles, Student Notes, Seminar Papers, and Getting on Law Review by 
Modern Legal Scholarship: A Guide to Producing and Publishing Scholarly and Professional Writing by 
Scholarly Writing for Law Students: Seminar Papers, Law Review Notes, and Law Review Competition Papers by The websites, conferences, and blogs of different organizations are a good way to identify current topics in the field of Mergers and Acquisitions.