As an example, my A level geography NEA was investigating river discharge and sediment roundness along a small river, I found the Hjulström curve was a useful graph in which I could base some hypotheses of my investigation upon. (About sediment becoming rounder and flatter along the course of a river). http://www.coolgeography.co.uk/A-lev.../Hjulstrom.htm
Otherwise, I would always stay up to date with the news, I like the BBC news but if there are any other websites you like then keep up to date with those too, in particular the science and environment section on the BBC. Or you can read geographical magazine or newspaper articles, you could see if your school library has any archives, or I read the Geographical Magazine each month. You can search for articles here https://geographical.co.uk/ for areas of geography that interest you.