To better understand (and write about) your research topic, you need to brainstorm the main concept(s) involved, and find encyclopedia entries on that concept. This will not only give you an historical context (how has the thing, theory, or technology evolved over time?, what people, laws and policies are involved?), but will also help you find the words and phrases that are essential for searching the scholarly literature. Once you have a handle on your concept(s), search the journal, book and other literature, using the "Information Sources" section below.
Choose a search tool from those listed below. CINAHL is the best resource for nursing-specific journal literature, but you may want to try others, such as MEDLINE for topics that cross into more general health and medicine fields or e-books for monographs.