i am, obviously, no expert on this but you can start by simply putting down your thoughts on paper as they come. you do not have to start with vivid imagery or metaphors or complex sentences right away ; simply write down what you feel and think. Try to write everyday, even if it is something small or just a few lines. Keep a journal and make entries whenever you have the heart to do so ! what matters is that what you have to say holds the most weight, think of it as a medium to put forth your views / ideas / emotions. You don't have to be perfect. If you do write something, I am right here, eager to read it !!