As a part of my assessment in school, I will determine the mass of a black hole from the x-ray data (not necessarily but I think x-ray is preferred in astronomy as well, I am open to recommendations) from an open-source database (Chandra, XMM-Newton...) and use Fourier transformation in order to determine the mass of any black hole.
I am not sure where and how to start and how to go. It would be great if you could show me the pathway I should follow and I will fill the gaps by doing research myself.
p.s.: first time using stack exchange please let me know if I am doing something wrong.