Marley was very much like Scrooge in life. However, Marley having suffered seven years of torment in the after life sees that that Scrooge is also destined for everlasting torment after his death and he seeks to redeem himself if only slightly by warning his friend Ebenezer
Marley tells Scrooge to expect three more spirits to visit him that night.
Jacob Marley. Marley foretells of 3 others who will help Scrooge
When Marley's ghost visited Scrooge he warned him about the ghosts and his behaviour.
Marley appeared to Scrooge and warned him about changing his behavior. Marley also told Scrooge he would be visited by three ghosts.
Marley tells Scrooge that he will be visited by three Ghosts the first as the clock strikes one in the morning
scrooge's partner Marley visited him first
Marley's ghost, the first of four, visits Ebenezer Scrooge.
To warn Scrooge to change his ways and be nicer or kinder to other people, or else Scrooge would end up like Marley(lonely and hated).
Three ghosts
When Jacob Marley came to visit Scrooge didn't believe that it was really Marley. So Marley showed Scrooge if he didn't change his ways that Scrooge would bear himself in chains of his wrong doing.
At mid night
Scrooge's dead business partner was Jacob Marley. He was the 1st ghost to visit Scrooge.