Chorus or Verse
(+chorus if previous section = verse)
Essentially what you want to do is get some solid riffs down in the same key preferably and then strign them together. If you want to make a song more interesting add little melodies and or leads to the song...something most pop music sucks at and most nu/hardcore metal bands can't manage....hack musicians...anyhow...
This format is simple easy to follow and works well with most forms of rock music...look at metallica, megadeth, slayer they all use this format.