i wanna start workingwith lucfier. where should i start

i had a relationship with him.. very weird one when i once had psychosis and i tought i was him.. i summoned him a lot and he punished me, anyways i summoned him a year after psychosis, he said he likes meand forgives me, i wanna have a relationship with him and workig with him. where shouldi start, and what even working with him even means