Basically, all you need to play darts is a dart and a target. You could also draw the target yourself on a piece of paper. But that would not be as much fun. You should have three darts per player, soft darts for an electronic dartboard and stone darts for a corkboard. This is already enough to make a decent game.
A catch field behind the dartboard is often recommended, as throws next to the target can damage the wall. Another recommendation from us would be a piece of paper and a pen if you use a dartboard made of cork to note down the score.