Need further information on raiding and gearing!

Hello guys. I am an Unholy + Blood DK. I used to tank till level 80 and now I want to switch to Unholy DPS on a first rate. I got dual talents and some 4.3k gs right now. I am farming EOT as much as I can. Please guide me on how to progress further for gearing and raiding. I need suggestions and tips on further progessing my character.

I'm also tryin to get shadow's edge. However, I am unable to find any players to help with Light's vengenance. I want to enjoy the play and would like to learn from the community what else to do to progress my character properly.

What pissed me off mostly was I had a fellow tank with 3.8k gs and me being 4.3k too. He was doing 4x more dmg than me in Recount. I understand I started as Blood tank so Im not that good. But, I want to build my character for raiding and RDF HC.

Apart from just spamming a post, I have read this guide. https://forum.warmane.com/showthread.php?t=349829