If you aren't sure where to start in your research or are having trouble picking a topic, the best place to begin is with current awareness sources. News articles, blogs, and social media are a good way to find current problems within the area of law you are researching. Browse news sources to get ideas, then--once you have narrowed it down--sign up for news alerts on your topic so you can keep on top of developments.
There are Medical and Health-related practice area concentrations in all three of the major commercial databases available to you. These are an excellent place to look over available treatises, find current news stories, and then locate the regulations or statutes that are being discussed.
The following organizations have current bioethics/health specific news on their websites:
Don't forget the manuals and ethics codes of the various medical, legal, and scientific organizations that have stakes in Bioethics.