Getting Married :
-Go to Riften, Find Maramal usually in the Inn of Riften (bees and bard?) or the Mara Temple, Buy the Amulet 200 gold,
-Go to the person your seeking to marry. (You have to have a friendly relationship in order to marry)
-If She accepts, go back to Riften, and find Maramal again to arrange the wedding.
-Wait one day, till your wedding starts. Then after a small monologue of Maramal, your offically married.
-If you talk to your wife now, she'll ask if you want to move into her house or yours. (If you have one)
P.S. I married Muiri, she owns a herb shop in Markarth, and i'm able to gain 100 gold everyday from her. I had to complete her "Mourning Never Comes" Quest in order to marry her.