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Polyhedral dice set (7-piece)Metal dice are the durable option; resin dice are the art option. Either way, 7-piece sets (d4 through d20) are the standard.
Player's Handbook (5th Edition)The PHB is the foundation. Buy a physical copy — it gets referenced mid-session more than any digital version.
Dice tray / rolling trayA leather-lined tray keeps dice on the table and off the floor. Large enough to hold 3–4 dice comfortably.
Prepainted miniaturesD&D Icons of the Realms and Pathfinder Battles offer pre-painted minis that work straight from the box without a painting session.
Dungeon tiles (modular)Modular dungeon tiles let the DM build room-by-room during play. Dwarven Forge and WWG are the premium options; printable PDF sets are the budget path.