Here are a few resources that have helped me a whole lot!
Keeping the Love Command - an eleven-part teaching series by Keith Moore
What Love Does - a nine-part teaching series by Keith Moore
Love: The Way to Victory - a book by Kenneth E. Hagin
How to Walk in Love - a mini book by Kenneth E. Hagin
All of the Marriage Meetings taught by Keith and Phyllis Moore
Marriage, Divorce and Remarriage by Kenneth E. Hagin