A research topic is a subject that you are interested in investigating. For instance, Bees is a Topic.
A research question drives your investigation. It is something that you want to know about your topic; something you will explore and try to answer. For example, "How do bees work together as a community?" is a research question.
Concept mapping can be a great way to brainstorm ideas and make connections between them. The following worksheets can be helpful to you in this process. But first, check out this tutorial on how use concept mapping to generate a great list of questions: https://uclalibrary.github.io/research-tips/questions/.