the easiest thing to do is to turn a beat on that u really feelin. and start freestylin to it. keep freestylin till u got a good opener or a good 4-8bars.

-OR-

U could listen to the beat until the hook part comes on and dependin what the mood of the beat is, write the hook accordingly and from there u'd have a mood and a topic to start writin ur verse around.

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Knuckels. I got a hell of a hand, u still developin man.//
I'll have you leavin' the ring lookin' like the elephant man.//