Be knowledgeable about what terms were used for your topic during the time you are researching.
Secondary sources can lead you right to a primary source since secondary sources often cite primary sources.
Try googling a topic keyword + "papers" or "archive" as this can lead to helpful results.
When you are analyzing a primary source, remember to ask the following questions and use them in your analysis:
1. Who is the creator of the source and for what purpose did they create the source?
2. What is the historical context of the source?
3. Whose voices, opinions, experiences are missing from the source?