As you find sources and learn more about your topic, you will become aware of the relationships between these ideas and you will need to find a way to express that structure.
Organizing your ideas helps you in several ways:
At this stage of the research process, you are starting to create the shape of your research "product" (a paper, presentation, etc.)
Concept mapping is a way to record and generate ideas by setting down the connections and associations between your thoughts in a map.
Here's an example of a concept map created in Coggle (https://coggle.it) for a hypothetical research paper asking how effective C.P.E. Bach was as a music teacher. The concept map includes information drawn from several secondary sources.
Outlining helps you find a logical sequence for your ideas. For example, you may begin by introducing basic concepts, lead readers through your evidence, and sum up what you have taught them about your topic. Outlining also establishes a hierarchical order of concepts, with major claims appearing above lesser claims and evidence.
You may have had teachers in high school that talked about writing five paragraph papers following the "claim - data - warrant" structure. While not all topics lend themselves to the kind of evidentiary argument implied by the five paragraph structure, it is still a good idea to think about your research topic in terms of formal symmetry and make a plan for how you will lead readers from one point to the next.