Good Question, most producers usally will say do your own thing. but the Structure is Intro verse chorus verse chours bridge chorus outro. but is you wannt to be complicated but a cool thing is Intro, verse,prechours, Chorus,Verse,prechours,chorus,pre bridge, Bridge, Breakdown , outro.
Just have fun i am big on Rnb i rip it up no lie. Holla back email me IM me ill help you. holla.