How can i learn to speak with different accents?

i dont want to speak in accents the typical way most people try to do it... but i want to sound like a real frenchman, italian, or whatever i want to sound like. i know it comes down to alot of times, how the person was taught english, like by a person from the UK or somewhere else... but how do i find out how to speak like that, and practice it? thank you!