Need help on reforge and gemming
The prevailing wisdom, here and elsewhere, is to ignore stamina. However work by Theck and others show that it's a fine stat to have, especially in trinket slots.
Ultimately what I've learned this expansion is that there are many acceptable and effective gearing strategies: you just need to find one that's best for your skill level.
Gemming, on the other hand... Unless you absolutely need the extra health to survive whatever you're tanking, pure stamina gems are a big no-no. Blue sockets can be a stamina hybrid, but you should at least use expertise/stamina gems in them until 15% expertise, then mastery/stamina (for a mastery build). You should put pure expertise gems or expertise/mastery gems in red sockets. Yellow sockets should be expertise/mastery or pure mastery. Prismatic sockets can be any combination of expertise and mastery depending on your expertise needs. (Side note: Replace "mastery" with "haste" in all of the above for a haste build.)
Similarly, you shouldn't be enchanting stamina if you have a better option--for example, your gloves should be enchanted with expertise, not stamina. Obviously you'd want the stamina enchants for legs, chest, and cloak (if already hit capped), though. (You do need to work on enchanting your gear, by the way.)
Once hit and expertise are taken care of, you'll want to reforge from the less useful stats like dodge and parry into the more useful stats like mastery and haste.
If you have any gem sockets (or partial gem sockets) that were not already filled in the hit/expertise capping process, there is now a question as to whether they should be filled with stamina-focused gems or haste/mastery-focused gems. Debate about this question rages quite loudly on the forums. It all boils down to whether you want to survive because you have a lot of health, or survive because you take less damage/smoother damage/more predictable damage.
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