Guys ... help me plz i need some rapin tips?

hey guys well me n my friends are 15 years old an we love freestyle raping u kno for fun we rap about each other like makeing fun of each other u kno. anyways i need some raps about them i'm a bit rusty cuz i neva really d alot before can u plz give me some hard core comebacks in raping about my friends ok one lookes like she has a freddy crueger nose she wears shortsan little slutty dresses all the time even in winter she is conceted n loves gettin hickeys on her chest from her boyfriend bobby n the other one is a black guy who looks like neyo only a chinese version sorta.. he wears skinnys um. bald .. he has really ashy hands n elboes eww.. hehehe an thats all i can remember plz help if u can