You should move back and forth between pre-research and your concept map.
Write a few keywords > do a little pre-research > edit your map > do more pre-research....etc.
What you find should change how you're looking for your topic - i.e. the words and concepts you're using in your search.
It can be really useful to create a concept map of your research topic.
It's worth spend a little time doing "pre-research" to find the keywords, vocabulary, who, what, when, where, and how of your topic.
This will save you time in the long run. If you're using the wrong search terms you won't find what you need.
Wikipedia and other basic websites or encyclopedias are a great way to find enough information about your topic to do a good search. You can use Wikipedia at the beginning of your research process, just not at the end.
What are the keywords you would use to describe this image?