Recommended Reading List:
1 Nephi 11:21-23
John 13:34-35
Moroni 7:45
1 Corinthians 13:1-3 (for what charity is NOT)
1 Corinthians 13:4-7 (for what charity is)
Matthew 25:31-46
1 John 4:18
Doctrine & Covenants 121:45
Additional resources:
Choosing Charity: That Good Part – Ensign, Sister Bonnie D. Parkin, Nov 2003
Charity: Perfect and Everlasting Love – Ensign, Elder Gene R. Cook, May 2002 (this one is really good!)