When you reach level 80, there is stuff you need to get in place.
Below is a list from No. 1 to 7 you should take them in the order as they appear, If you have a level 80, you dont need to go through points 1,2 and 3 because it binds to account
1st You must have the reputation of the Sons of hordir for shoulder enchants.
2nd You must have the reputation of the (Read below) for head enchants.
Melee: Knights of the Ebon Blade
Tank: Argent Crusade
Healer: Wyrmcrest Accord
Caster: Kirin Tor
3rd If you PVP, then you should also run reputation with the Valliance expedition for head enchant.
4th Get some gear in normal instances - List below ( this can altso be done to gain reputation )
Trial of the champion standard
Forge of Souls Normal
Pits of Saron. Normal
Halls of Reflection Normal
5th Start running RANDOM heroic instances for badges to buy tier 9.
6th After that buy "Off-set peices" (Belts, ring and so on) so all your gear is the minimum item level 213
7th Start raiding.
Best Regards.
The G.o.N. Crew!