Just bought Death's Encroach, looking for some advice.

As the title says, I just bought Avacyn Restored; Death's Encroach and was looking to build the deck up to a B/U deck, preferably sticking with the Zombie theme primarily and maybe focusing on a swarm effect (as in, zombie token generators if such exists).

I've collected a few cards before, however I doubt many of them are actually relevant to my new deck (I generally collected Myr cards because....well why not). So any advice on what to remove/ what to add would be appreciated.