MC REN practices knitting string from Compton all the way to the east coast.
practice , as in guitar, tennis, or jerking off
training - more serious than 練習； more like for the army or kung fu
senrensareta - literally 'polished.' Like the 'after' version of Eliza Doolittle - rich but also well-mannered. Not like Paris Hilton. I guess 'cosmopolitan sophisticate' is the best English equivalent. Also applies to hi-class things that have been made in a very skillful way.
Continue to SELL drugs. Go EAST to practice Kung Fu.