yes. you can. alot of people like to believe that power is hereditary (in some cases it is) but most of the time, it is not. everybody has the power to do magick.
(the reason most people think it isnt hereditary is because they traced down their lineage to their greatest ancestor who did not have any magical powers and wondered why it all of a sudden ran in the family)
to answer your second question; Magick, Herbalism, Energy manipulation, Meditation, etc.