I'm looking to get into modern and i need a little help building my deck before i buy the cards, i want a vampire deck that puts creatures in the graveyard to put counters on the vampires and be able to bring them back. I've done a little play testing and it worked ok but i think it could be better any advice would help, thanks.

this is supposed to bring back the creatures after i sacrifice them
4 Accursed Spirit
4 Necromantic Thirst
4 Mortuary Mire

this is supposed to help me find the cards i need
4 Viscera Seer
4 Carrier Thrall (it's cheap and makes a token after i sac. it so it has double the potential)

this should give the vampires counters
4 Captivating Vampire
4 Indulgent Aristocrat
4 Vampire Nocturnus

4 Quag Vampires (multikick should give it a good P/T)

4 Gifted Aetherborn (it's cheap and death touch with lifelink makes it a good blocker until i want to sac. it)

this is supposed to get rid of my opponents creatures
4 Bone Splinters
4 Gatekeeper of Malakir

just the swamps lol
20 Swamp

i don't know what your meta is like, but i wouldn't bring this to an established modern meta.

If you want to "get into modern" i would suggest looking at the established budget decks available in the format.

https://www.mtggoldfish.com/decks/budget/modern#paper

What did you play test against? What do you know about the shop you'll be playing at?