Sorin's Vampire Horde

Thanks for the advice. Im still pretty relatively new to Magic, im trying to learn how to build very well-rounded decks for any style of play and concept, so im very appreciative for the help. I decided to cut out some of the more expensive creatures, Baneful Omen, and Aspect of Gorgon and add healthy amounts of removal for control of the board. The main concept of this particular deck is mostly lifelink-based aggression and using captivating vampire and bloodline keeper for filling the board and buffing. I feel much more comfortable now with removal spells and a lower mana-curve. Would you have any more advice on what I could do from here that would help even more?

Then welcome to the world of magic! Experience will come as you see other decks, play against unfamiliar decks, talk with people about your decks and so on. The most important thing is having fun, the second one is playing enough. (Sadly I built more decks than I could test at the moment but perhaps better times will come ;) )

You might be interested in http://www.mtgvault.com/muktol/decks/how-to-build-a-deck/. This is a basic description on how to built a deck, do's and dont's and so on.

Basically there are many ways of building a vampire deck: Combo (mostly liegain/ lifeleech), aggro with a big part of control, mid-/ lategame different colors and so on. The basic idea about building a deck is having a strategy and stick with it (As you might allready have read in the 'how to' link I provided above). Mixing strategies is a not so good decision most of the times. Remember that your deck can't be good against every deck and that you have a sideboard where cards taht you feel that you could use against decks you are weak against should go.

'Lifelink-based aggression'...with the new zendikar expansion came some cards that benefit from lifegain: Bloodbond Vampire, Defiant Bloodlord but most of those benefit from quantity in lifegain rather than quality (1+1+1>3). The basic question at the moment: Is "Vampire Nighthawk" enough lifegain? Because that's your only creature with lifelink. "Blood Artist" can produce some life but for that something must die, "Sorin Markov" can to but he's in the deck only once, so the chances of drawing him are rather low without tutors or carddraw.
If you want to built this as a vampire lifegain deck I would re-think the card choices. What I would do at the moment is clone this deck, so that I have one to play around with and one that resembles the status quo. If you finish one of the decks you can either leave the other as it is or start rebuilding it.

Firstly, thanks for the welcome, lol I've been playing for nearly 5 months now.

And I had originally put in Bloodbond Vampire, because I noticed its ability was basically the same as Ajani's Pridemate, which served me very well in a white/black standard deck that I built. Although I ultimately decided it wasn't worth it, as it had a higher cost and Ajani's's Pridemate worked best as an early drop. I also dropped Defiant Bloodlord to lower the mana curve. Vampire Nighthawk and Blood Artist are the only early-drop cards with life/stealing abilities, yes. I have 3 Mark of The Vampire enchantments to buff some of my other creatures with lifelink. The earlier form of this deck featured 2 Falkenrath Noble, but I decided to take them out in favor of removal spells Go For The Throat and Murder after you helped me see I needed more board control. I also have Kalitas and Anowon as creatures to assist with removal, but their higher mana costs make them unreliable on their own.

Overall, the summary of this deck's purpose is to sap life from my opponent, and keep control of the board as best as I can to utilize Bloodline Keeper's token ability, and use Bloodline Keeper, Captivating Vampire, and Bloodlord of Vaasgoth (whose ability is so much easier to trigger now with removal spells) to buff the tokens and all my creatures in general. Another big advantage i planned on having with this deck is that if I can get enough vampires out with this strategy, I can use Captivating Vampire and Kalitas's abilities to take control of my opponents' creatures and make them even stronger for myself.

But yes, I'll definitely think about what I can cut out in favor of better cards for this concept

Another option would be to built a B/W standard legal lifeleech/ lfegain deck. I've been working on one (http://www.mtgvault.com/muktol/decks/standard-life-gain/) but it's still under construction so the help it might provide is limited.

Some further suggestions I found after a quick search:
Brutal Hordechief, Foul-Tongue Shriek, Kalastria Healer, Retreat to Hagra, Suffer the Past, Syphon Life