Looking at the current armories, it looks like you want the haste enchants on the WoD enchant-able pieces with the haste base BoA's as a base. Then just get generic good cloth gear to finish it out. For most gear stuff, check out the armory list near the top of the page. For glyphs, minors don't do anything. For major glyphs, it depends on what you are doing. For 2's arena and 1v1 duels, mind harvest is pretty insane, it instantly lets you use Devouring Plague after 1 mind blast (compared to waiting ~16 seconds to cast it two additional times), DP does massive damage and heals for the same (800 + initial and the same amount over a few seconds, more than any ability in the bracket that I can think of bar crits). Otherwise glyph of weakened soul can give you more shields, glyph of reflect can make it so when shield yourself it will deal 500 damage or so overall to whoever attacks you, not too sure about other glyphs although someone will probably know.
Key abilities.
Spectral guise, cooldown invisibility, use when your in trouble to go invis and get away, leaves a shadow double behind.
Mind blast, nuke ability, use to get orbs to use Devouring plague
Devouring plague, uses 3 shadow orbs (only gotten through mind blast), deals massive damage, heals for the same as damage dealt.
Shadow word pain, keep this up on the opponents, keeps them out of stealth, hits hard, procs elemental force
Vampiric touch, similar to SW

but has a cast time so careful to use it around rogues.
Power word Shield, this should be up when it can be up, obsorbs a large amount of damage, no cast time
Flash heal, quick (mana consuming) heal, heals for quite a bit of health, can usually outheal damage from a single source when you spam this, even as shadow it heals for a significant amount at 29, throw this out whenever anybody is getting focused, somebody being alive is better than a vampiric embrace going off.
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Mind Flay, filler spell, if you aren't getting focused, or aren't healing an ally getting focused, or throwing on shields, you can use this, probably better to just re-apply SW

now that it has that initial instant tic (mind flay is channeled so you can't do anything else while using it including moving).