Ok, my $0.02.
First things first, your spec.
You have a lot of the right talents, but some wrong ones too.
Drop 3 points in Scent of Blood and 3 Points in Vendetta. As blood you don't have any problem generating RP so you shouldn't waste talents on something that is designed to give you more. And you shouldn't have issues regaining health as blood either. So these 6 points are better served somewhere else.
Put 1 point into Improved Blood Presence, 5 points into Blood Gorged, and a point into Dancing Rune Weapon. Not sure why that other dk said dk's don't use that. If you're not using Empowered rune wep, hysteria, and DRW whenever it's up then you're gimping the hell out of your dps capability. DRW + HS + Hysteria + ERW = death everywhere. Probably explains to me why he's a blood dk with the gear he has and is only doing 7.5k.
In the UH Tree you need to drop a point in Epidemic, 2 in On a Pale Horse, and one in Unholy Blight. Those are wasted skill points as the dps they provide or the effects on proc are wasted. Take those three points and put them into Morbidity. As many DC's as you'll be using... extra dmg on them is always a benefit to your dps.
The other dk was right on rotation though. Maxdps is probably the best designed rotation for just learning the blood rotation. But remember... HS is your highest dps skill... so the more times you can hit it, the more dmg you do.
Maxdps.com will also give you a idea of what gear to go after as blood. just turn down the loot levels to what you/your guild runs and see what is attainable for you.