[MtG] So like how would I build "ZOMBIES EVERYWHERE!".dek?

So like, I want to build a deck, but I can't figure out how to do it. Mostly Mono-Black, built for modern format using the cards Gravecrawler and whatever, So... Disember and Doom Blade are obvious musts, maybe heartless summoning so I can cast 4 1/1s for free, and then Grimgrin as the main beaststick sacking all 4 of my 4 1/1s to power himself up. It's radically untested and I would like to ask my local store about it, but it seems like a fun deck to play.