One way I think of sus chords (and alot of other chords) is in terms of polychords, i.e. F/Db, G/Eb, etc. A nice way of voicing sus chords and what I usually use to voice them is using this idea: I/bVII. For I, you want to play the root chord but without the third, just the root and the fifith. Ex. just EB instead of EG#B. For bVII, you want to play a major triad for the flatted seventh of whatever the chord is. Ex. for an E chord, the bVII is D, therefore you will play a D major triad (you could add that major seven too if you want).
So now for an Esus you get,
I/bVII
LH/RH
EB/DF#A
Or
EB/DF#AC#
Since you're on the organ, you can play around with some inversions will playing an E on the pedals.
BE/AC#DF#
DF#A/BDEA
F#B/EABD
You get the idea. Sorry if these inversions sound funny, I'm not at a keyboard right now. Just remember that the four (A) is what really makes this chord and you want to leave out the third (G#). Adding the G# will change the sound and the chord will loose that sus sound. Hope this helps.
