I'd say focus more on vampire related cards. Blood Tribute is nice with Sanguine Bond and Sorin Markov is just a BA in general.

have you thought of adding Cradle of Vitality it can give your life gainers a big boost and more life

No I haven't! seems like a great addition to the deck, although I'm not quite sure what I should switch it with

you could take out sorin they have the same amount of mana to play them unless you want to keep him in the deck

I feel like that trade isn't really equal, he's my source to my lifelink army and to eliminate the main threats. (He's my defense)

Blood Artist is a great card for lifegain and lifedrain.. Path to Exile for removal, or Unmake if your on a budget..

whats the difference between modern and other game types? is it slower, faster? and mana wise, why do you have more black mana then white mana when you need more white?

this link may answer your question.

http://www.wizards.com/magic/tcg/resources.aspx?x=mtg/tcg/resources/formats-sanctioned

Day of Judgment for mass removal or card:Black Sun's Zenith for indestructible creatures.

Would Killing Wave suffice as mass removal more than Day of Judgement?!?!?!!? I was thinking that if my deck is based on lifegain i should have no problem dealing with my side, and if at least Exquisite Blood is out it would be a lot more interesting

Blood Artist seems like a viable option, but it seems very slow in the way I'd be handling this deck, unless this deck is more token oriented I feel that it doesn't really belong. (Same reason I didn't add the soul sisters btw)

i know the rules, but i meant is modern's metagame faster or slower then legacy? is their a ton of removal? a tone of certain win combo's?

in most formats, Killing Wave is worth then Day of Judgment because they get to choose the creatures they keep, making it easier for them to use combos or keeping the bomb they snuck out.