Yeah i'm new to guitar tricks. Of course lyrics are very important but what works best for me is to close my eyes start playing some rythm throwing in a few cool riffs and dreaming. Try to tell a story. As if you don't already know this. IF you can make someone laugh or cry, or cuss you know you've a song well written. Musically i do as you all probably do too. try to invent something new, wierd chord progressions that mix well with an off beat melody. Anything that will turn an ear my way.