First we need to know what you have considered!!
Anywho, make up a route and have a gpx file available for it. I do a lot of route planning on ridewithgps. I do strava first then convert it to a gpx file then load that onto ridewithgps.
Come up with some sort of cue sheet that at least covers water and resupply.
Put together a facebook page and perhaps a small website.
Announce it on the different bikepacking forums and bikepacking web sites.
Deny all involvement!