Adjust your organ sound. While a lot of what you play will be accompaniment, you should set the bass and treble sliders so that your sound is "punchy" enough to carry a solo. Hold middle "C" down and move the tone sliders, located just above the keyboard, up and down until you find a tone that balances the softness required for accompaniments with the brightness required for your instrumentals to break through.
Set your organ percussion to a moderate tempo. Push in the toggle switch for your desired type of percussion accompaniment. The toggles are typically located to the right of the keys. Adjust the tempo slider until it is moderately brisk. It should be up-beat enough to allow for an enthusiastic and expressive playing style, but not so fast that you can't play your riffs cleanly. Adjust the slider, play along and adjust again until you feel comfortable.
Play left hand notes on the "off-beat." The "off-beat" is the "and" part if you count "One and two and three and four." The distinctive funky feel in COGIC music comes from the placement of the bass notes. By playing the bass notes in between the crochets in the measure you add a feeling of movement and swing to the piece. Set your metronome and practice hitting the left-hand bass notes in between the clicks.
Once your comfortable with the bass note placements, play the right-hand chords on the click. Practice with the metronome off use your own sense of rhythm to keep time.
Invert right-handed chords four times per measure. To create a feeling of crescendo, it's common for COGIC organ players to switch chord shape. To invert a chord, rearrange the order of the notes. For example, if C Major is C,E and G, the first inversion is E,G, C.
Mike Bereal, an acclaimed COGIC organist, in his tutorial on COGIC style organ playing demonstrates a phrase where he inverts the chord four times in a single measure. This adds a subtle "lifting" feel to the song.