-open up maya ... press f1
-read everything in there .... twice

-read all these tutorials
https://www.learning-maya.com/rendering.php

-come into simplymaya live chat and ask there

-or post a scene file

To create a light optical effect
Create a light for which you want to apply and position optical effects.
In the light's Attribute Editor, map the Optical FX utility to one of the light's attributes (for example, click the box beside Color then select Optical FX from the Glow Utilities tab in the Create Render Node window).
IPR render the scene to see the optical effect.

Re-position an optical light effect
You can move the glow or halo you have attached to a light or include more than one optical effect in the scene.

To re-position an Optical FX utility node
Create a Locator and place it anywhere in the scene (Create > Locator).

Shift-select the locator in the view, then select the light.

You can now move the locator anywhere in the scene and the optical light effect moves with it.