Sometimes it can help to first read an entry from a reference source on your topic. These won't count as a scholarly article for your assignment. However, they can be very useful to to help you understand the overall topic and/or to discover specific subtopics that you may want to research.
The Human Diseases and Conditions provides very useful overviews of medical conditions. The Sage database provides high quality reference articles on human development related topics.
a.) The EMU Library has a directory of organizations that you can search online. See Associations Unlimited below.
b.) The people you interview for your project might know of support organizations.
c.) You can also try searching Google to identify support organizations.