Ok, I have a band (dance-funk-pop-electronica-teensiebitofmodernrock) with 6 guys in it. Drummer, Bassist, Keyboardist, 2 guitars, and singer. Does anybody have any tips for arranging original songs so that when everyone plays at once it doesn't sound bad?
Harmonizing and chord inversions. Look into some melodic metal bands. They often have such line ups. See what they do.
How much theory do you know?
Your lineup reminds of the new GN'R one, so you could listen to how they arrange things.