Hi Raluca, I think the first step would to be read widely in the area, to see exactly what it is you are interested in investigating. Then I would suggest finding a mentor in the field. I've recently started researching in this area myself - I've joined Susan Thibeault's lab at University of Wisconsin-Madison. Then go for it :)

thank you very much. This is actually what I'm doing. Finding a mentor is a bit difficult.

Seek and apply for summer research opportunities where there is someone working in the field you are interested in. In the USA many Medical Students interested in research take a year off between their 3rd and 4th year of medical school to work in a mentored research arrangement.  I don't know what is available in your location but in the USA there are many Academic Institutions here that have funded programs available to facilitate this.