You can build a research topic through a mind map. You can use pieces or paper or textboxes to arrange your ideas.
In free association, you allow your thoughts to flow freely without interruption. You later review your thoughts and select what is useful/interesting.
You can create a research question, and explore a research topic, by answering structured questions related to an initial interesting topic. These questions help you choose a scope for your research question and will help you if you need to adjust your research question in the future.
Questions are: