if youre set on Red/Black, pick up some Blood Crypts, Blackcleave Cliffs, and/or Bloodstained Mires. Again, helps smooth out the mana base. You want cards on theme; they should either gain you life, do damage, or preferably both. Child of Night is a good 2 drop life link; Olivia Valdaren, Olivia, Mobilized for War and Stromkirk Captain are also nice additions. Vampire Nighthawk is a 2/3 flying lifelinker that's a royal pain in the behind. Feast of Blood is a nasty two drop sorcery that requires 2 Vampires to cast. You destroy a creature then gain 4 life. Bloodchief Ascension is a 1 drop enchantment that allows you to do more damage over time. Lightning Bolt, Searing Blaze, and Blighting are decent direct damage (with added discard for the blightning). Terminate is more creature removal (but its BR as opposed to 1B). Captivating Vampire is a nice 3 drop that's an OK alternative to Olivia Valdaren (though she;s still better). Blood Artist, Gatekeeper of Malikir, Bloodghast, Kalistria Highborn. Oh, if youre trying for discard, might want to think about Liliana's Caress, Inquisition of Kozilek, and/or Thoughtseize. Just some suggestions
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Add some Temple Gardens and/or Razorverge Thicket. Helps smooth out the mana base a little. Also fetch lands. With MM3 being released the prices should come down a little bit. If you want to do stupid/silly things, get 4 Heritage Druid (tap 3 untapped Elves, add 3 Green to mana pool), elvish Archdruid (elf Lord + add 1 green mana for each Elf you control), and Ezuri, Renegade Leader (Green: Regen target Elf, 2GGG: Elves you control gain +3/+3 and trample till end of turn). Collected Company is absolutely beast in Elves (3G: Look at top 6 of library. Put up to 2 creatures with CMC 3 or less onto the battlefield. At instant speed). That's the basis of most Modern Elves decks. Or you could splash black for Shaman of the pack. That's my recommendation. Hope it helps
Youre running the deck backwards. Most of your sideboard you would want mainboard, especially Archive Trap( what with all the fetching going on in Modern). Mesmeric Orb flat out wins games, getting you that last little bit of mill. Hedron Crab, Visions of Beyond, Ensnaring Bridge, maybe a Sun Droplet or two. Might also consider Shelldock Isle (Hideaway Island from Lorwyn). It enters tapped but it lets you look at the top 4 cards, choose 1 and exile it under Shelldock. Id go less slow mill and include only the big chunks; Glimpse, Scour, Mind Funeral, Hedron. Maybe splash white for Path to deal with any real big threats. Any way, that's my two cents, do with it what you will.
what format were you looking to play in? based on the card list it looks like Modern. Depending on how competitive you want to get will dictate recommendations