The basic set, after all of these years remains the best way to introduce young players to the world of Dungeons & Dragons. The original set include everything you need to run your game (description of the character classes, clear and easy to understand info for the DM, a few pages with the most common monsters, a set of dice and an introductory adventure). If you intend to run a long term campaign in the original D&D world it might be better for you to look for a more recent edition that will hold the basic-expert-compagnon-master & immortal set together but wont include the introductory adventure and the dices, but if you just want to show the game to some younger players this old set might still be the best choice.