How do you write the lyrics to a rap song?

Ok. so if you want to write a rap heres what i do.

1st. think of a topic.

2nd. make sure you topic is something people want to hear.

3rd. start writing rhymes based on that topic. (hint: when thinking of the hook try to make something that's gonna be stuck in peoples heads. That way they wont forget it)

4th. try to use slang Words like for instant instead of sayin have to you could say haff to.

5th. once you got respectable lyrics take it to your local studio and put the track down.

(Hint: if you having trouble thinkin of a hook or a topic. You could either base it on life experience or try placing you self in someone elses shoe. how would that make you feel.)