Choosing a setting is a vital part of preparing for your next D&D campaign. As a DM you have lots of control, you get to determine the villains, the grand themes, the style, and perhaps most importantly, the setting of your campaign.
Getting into the game of D&D requires little to no actual stuff, you just need the rules, a sheet of paper, and a willingness to roleplay. However, there are a ton of fun items that go along with the game that can heighten play itself or simply entertain D&D players.