There are several guides out there. Are you looking for a rotation guide, Gearing guide, or just basic gemming/enchanting/glyph guide?
Armor GuidesThere are
several different sets of BiS gear for tanking. It all depends on what you want. Ensida has a great list of all BiS lists. Easiest and best to use at this time ingame is the EH (Effective Health) set. This give you the highest armor possible for decreased hits and high Stam to take the hits.
http://www.ensidia.com/forum_topic.php?forum_id=36&topic_id=28655Also, on the same topic, it tells you about the best rotation to use. Also remember to macro Rune Strike to all your abilities. Its on next swing and does a high amount of threat.
The guide has all the macro's you could ever want already made for you.
Glyphs and gemming is there as well as enchants.
When you hit 80, the easiest trinkets to get are the Black Heart from ToC and the armor trinket from Triumph badges. They will last you until you get the Corr Key and another trinket from ICC, or the Stam one from ToGC.
www.tankspot.com is a lovely site that after you get started, they can help you. But it can be confusing as everyone has their own opinion. It just mainly comes down to who's information you want to use or not.