Fuck all that, fuck multies, fuck punchlines, fuck all that.. when you write you have to worry about making sense above all first.. Think about some shit that everyone can relate to or laugh at.. then after you've mastered making sense, the punchlines, multies and all that other shit should come naturally if you're witty... No matter what anyone says, they can teach you how to write, yo rhyme scheme depends on what you preferr, but the words are up to you. you can start off with multies and have internal rhymes in it, like

To Each His Own, I'll Tap Ya Chin, Til Ya Speech Is Gone/
I Rap Ta Win When The Beat Is On, Clap Mac-10's to Delete Ya Dome/


I mean, I just find words to rhyme with, and internal rhymes help a lot.. but other than that, you have to listen to different styles to get a feel as to how you should write..

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"I Must Be The Greatest"!!!!