good news, he got his visa last week and will be arriving here thursday

next question now is as i am a EU Passport holder and he is pakistani passport holder what is the next step. he has been granted a six month multiple visa.
anyone know what the timeline for a citizenship process is and when best to apply for this. does he have to wait for PPS no etc, or can he apply immediately, what about GNIB card i hear he needs to get all that organised.
thanks