Number 1 tip for people building decks is that it is generally best to have 4 copies of as many cards as possible. The odds of drawing a cool combo if you only have one of each card is super low, whereas the odds of getting it if you have 4 copies of each is about 16 times higher.
As well, focus on cards that boost your strategy. If you never draw cards like
Death Baron or
Rooftop Storm, there's not any reason to have so many Zombies. It isn't a zombie deck unless you have cards that actually benefit from you having zombies. Try looking up Instants, Sorceries, Enchantments, and Planeswalkers that mention Zombies as a starting place, then look up competitive decks that use Zombies (don't worry; there are definitely some budget cards even in a professional deck).
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