Paper marked with an isometric grid is useful for creating a 2d representation of a 3d shape.

The most important thing you can do to accurately draw a shape on a 3d grid is to take your time and work systematically.

To begin with construct your drawing one block at a time. As you get better you will be able to use quicker methods.

Isometric paper has a right way up. If you use isometric paper remember that the horizontal dots must be further apart than the vertical dots