In the UK, if you wish to operate commercially, it is regulated. Undertake some on-line learning ( principles of flight, Meteorology, Map reading ) then attend ground school for 3 days ( air law, air safety, aircraft knowledge, human factors deployment procedures in accordance with your ops manual and flight reference cards ) and then finally complete a flight assessment on type. On successful completion you can then apply to the CAA for "permission for Aerial work".
But if you want to operate illegally, for some illegal purpose?
