be in a really good mood next time you pick up your guitar! this works for me always when i write it reflects my mood so anytime you come home an ya feel energetic an happy play but dont try an write something i always find cant make somethin come but if you play around for awhile i usually come across a riff or phrase an build from there. as to write the chorus get into the part of the song your playing so that is all you are really thinking about once your whole mind and body is into it (youll know cos you should be bascially dancin away to it or is that just me?)then hopefully youll feel what should come next or youll hear it in your head.