Check the official Twitter for the winners and don't hope for much, also you're starting but I hope your Union is active and strong otherwise you won't get all the rewards from this Union.
It basically goes; kill Lilims (AP Summonable) to get Grails thus getting buffs to fight Demon Raids (BP Joinable), most of your rewards will come from both Union Subjugation Points and Union/Personal PP but you want to get everything in this events IMO.