Queen Marchesa, vampires, and kill spells

Hey there, everybody! I've been struggling for a while to get a couple of simple "themes" put together with Queen Marchesa at the head.

• Vampire tribal
• Lots of kill spells (or any simple, targeted removal).
• Simple, such that I could loan the deck to a newbie and they could figure it out. I.e. Winning through combat damage, synergies but not specific combos.
• Optional bonus points: wealth/nobility as an artistic theme

While the decklist doesn't yet reflect this, I've been looking up resources and videos so that I can turn this deck into a simple, consistent, mid-power deck that uses the commander and kill spells to politic while vampires fight my battles.

But I'm the worst deckbuilder I know.

Pet cards, enjoying weak mechanics, a dedication to the Vorthos side of a deck, and more make it tough for me to angle a deck in the direction I want it to go. So, after some failed Google-fu, I've come here.

How can I build for a simple gameplan of vampires + kill spells with this deck?

I know kill spells are usually a losing trade in Commander, so let's assume I can use them somewhat optimally as political tools and to help get my vampires through defenders. What sort of effects would I need on my vampires? What sort of spells help keep me in the game after a board wipe? Do I need different cards to avoid going for a vampire battlecruiser? Do I need more kill spells? Can I put [[Vampire Nighthawk]] in?

I'd love some advice--general or about the decklist posted above--to help with this! Thanks, you all :]