Buy or find an Amulet of Mara
Equip the Amulet of Mara
Talk to an eligible marriage candidate
Complete any required quest or favor for that character
Choose the marriage dialogue option
Go to Riften
Speak to Maramal at the Temple of Mara
Arrange the wedding ceremony
Attend the ceremony at the Temple of Mara
Say yes during the wedding
Move in with your spouse after the ceremony