If you want a decent song follow this simple format...most bands in the past, in the present, and in the future will use this as the corner stone for the organization and structure of their songs....

Intro
Verse
Chorus
Verse
Chorus
Breakdown/Bridge/Solo
Chorus or Verse
(+chorus if previous section = verse)
Outro

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.
- Enjoy