You can ' t join NPC factions . You can do missions for them . The ingame Agent Finder will help you find agents to work for . You start with a level 1 agent , and as you gain standing with the corporation you can use a higher level agent . If you gain faction standing , you can also use any agent in that faction . For example I do missions for Caldari and Amarr corporations . To keep the Gallente and Minmatar from hating me , I also do Sisters of EvE missions . I also decline ALL missions vs . player factions can only decline one mission per agent every 4 hours . If your standing drops below 5 with a player faction , you won ' t be welcome in their space . I have good standing with Caldari and Amarr player factions , so I can use any agent for any corp in those factions . You can join player faction militias , to participate in faction PvP warfare , though instead I ' d strongly recommend joining a player corp that is involved in faction warfare .