Do you like to drop in as many encounters as you can for every campaign? Do you love testing your players HP in dungeon crawls? Any excuse to cast fireball with reckless abandon?
To start playing Dungeons & Dragons, you will need a few things. First, you need at least one friend to play with. You can play solo, but the game is not designed this way and it makes it much harder to enjoy your time playing. Second, you will need your imagination. If you have played video games where there is a large amount of story and dialog (like Fable, Bioshock, Skyrim) then you already have the right mindset for playing D&D.