[@6slyboy6]
Two ways one is to make a pad https://titanpad.com
then post the link once groups are formed. 
Two the planet or area is fairly big, with the little communication you can have sub groups form and have a major group. Like well districts or areas. 
Alpha is the main
then its separated into X amount of districts and given names or numbers
Though you also if your worried about keeping up we could use google docs since those are share able we can color code. How ever for something like this we need people to be the bad guys or the victumes some way to give us the missions or to form plots