Sq guys like to set their EQs to flat. SO go download a test tone generator and make a tone for each band on the EQ. Play a single tone and adjust the band on the EQ that corresponds with the freq. just move all the adjustments around till all the note sound the same volume. Then run a full sweep and listen for any swells in the freqs and see if you can't adjust it out if you hear a couple, but you might not be able to get to them all if there is a swell in an area the bands don't cover (The downside of a Graphic) but with an EQ the broad i don't thinkyou'll have too much of a problem.
After this a lot of people like to boost the highs and the lows a bit, just move it around a little to your liking. Flat is a good place to start though.