where to find anime sheet music/guitar tabs

[Lithium381]

i'm trying to figure out the guitar to "good or don't be", one of the songs from the 26th episode of Neon Genesis Evangelion. It's played in guitar chords with a piano melody, my bro can play the piano part, leaving me to play the chords. i've got the sheet music to it...it doesn't actually tell me what chord to play, so i play all the notes on the staff(the chords) and it sounds wrong, the piano part is right, so i know it's the right key, and yes my guitar is in tune. any resources? any help is welcome, thanks!