Harnessing the powers of the frozen north, Frost Death Knights use their bitterly cold abilities to freeze the very marrow of their enemies bones.
An extremely useful tool for overall optimization
WoWhead Frost guide
http://www.wowhead.com/frost-death-knight-guide
Icy Veins Frost guide
https://www.icy-veins.com/wow/frost-death-knight-pve-dps-guide
Noxxic Frost guide