Stroking a path

Open a new document 600px by 500px

Set the background color to black.

Create a new layer. Select the pen tool and draw a path as shown below or draw a path you like, as shown below on the image

Select the brush tool from the tool box, set the foreground color to white and background color to black. And select the brush style for this tutorial i select the hard round brush.

Select the pen tool again and right click on the path and select stroke path, on the pop up window select the brush and tick on the simulate pressure, as shown below

Now delete the path the right clicking on the path and select delete path.

Change the blending option of the layer, double click on the layer and select outer glow and set the setting as shown below on the image.

Here is our final result