While I can spout off such things as what is the basic stat you want (ie Agility, Strength, Intellect) for each spec a lot of the “finer” details I have to research. So I thought I’d share some sources I currently use.
WoW Reforge http://www.wow-reforge.com
When Cataclysm went live Reforging came with it. It was a way to “make do” with gear drops. Secondary stats can be changed. Back in ICC I refused to roll on Ikfirus’ Sack of Wonder. It had all this Hit & Expertise on it plus 3 gem slots. I stuck with my Sanctified Shadowblade Breastplate with Crit, haste & 2 gem slots. Why? It wasn’t for my 4 piece set bonus. It was because I was over the hit cap. WAY OVER. So far over that it was a wasted stat for me. As an Assassination Rogue I need to hit the spell hit cap (17%) instead of the special attacks (aka melee) hit cap (8%) . Actually by the end of ICC I was over the cap on Hit, Expertise & Crit. I was stacking Attack Power & Haste because those were the only things left. With reforging I can get rid of my overage and can fiddle with secondary stats, but that requires math. So I use this site to help. I log out in the gear I will be using. Pull my character up on the website, manually select that hit is at my desired setting and expertise, then with a push of the OPTIMISE button you get a guide to reforge.
Sometimes it seems a little weird like reforging out of hit on 1 piece of gear while reforging into hit on another. But in the end I ended up exactly at 17.0% hit & more mastery than before.
