There is nothing you can say as "Most important". But i have a hard time finding good tokens for the creatures (especially the Old Ones) to use. Most of them look quite awful, when strechted to match the size relations. Most needed creatures for the campain would be for example the Deep Ones, the Star Vampire, Dagon and Hydra, Fire Vampires (there would be a fireball quite good enough), the Cthonian, the Dhole, the Byakhee, Shen (Insect of Shaggai). A bunch of Cultists (egyptian, american, european, mutated aka "Hybrids" with deep ones). From the Great Ones it whould be Nyoghta, Shub-Niggurath (and the Dark Youth),the black Sphinx and "The Beast".. Investigators or NSCs are quite troubly, cause the interest of the players vary extremely. But i could make use of policemen, sailors and soldiers from the 1920s and for example typical civilians (probably in different colours?) like townspeople, tuxedos, high dressed people and workers. Probalby there do exist some token packs with useful tokens for the humans, but i was not able to locate them by now. The name of the campaig is "Day of the Beast" (the german version) I would really appreciate the work, but i do not want to cause any trouble or stress. it is not necessary to haste.I think it would be best, if you enjoy your work, even if you did not play Cthulhu so far. (Not yet does not mean never ;)).