LolIHateMyself

So I've been trying to recreate the Gmod gamemode Trouble in Terrorist Town into ArmA 3 (because ArmA's combat engine is way better than Source in my opinion), however I am not a scripting wizard, and I was wondering if I could get some tips on selecting the roles of players (Innocents, Traitors, Detectives) without just displaying to the entire server who is a traitor, or manually hitting a random number generator. As a secondary Objective, I'd like to also know how I can create or find a premade menu interface for Traitors to buy traitor items. If you have any leads like youtube tutorials or some open source scripts it would be greatly appreciated