While defining your research question you will be doing some research already, e.g. to:
check for is more background information
check if the topic is already 'done' and what niche you can research/explore further
get a clearer idea to be able to narrow down your topic.
Where to start looking?
Use search engines on the internet will for many of us be the first step (Google, DuckDuckGo, Bing, ...)
Ask people (teachers, parents, librarians, ...)
Search the library catalogue to find books or magazines
Use the databases the school is subscribed to
Newspapers, Museums, Blogs, ...