I dont have a tutorial link for you but there are many different ways to do it. If you have grow set up now you should list what you have so people can provide you with something that works with what you have bought.
I know at Lowes/Home Depot in the ventilation section they have curved thin pieces of metal. All you would have to do is put some holes in your your outlets, you could probably fit 12 if you use Y-splitters. Instead of outlets you could mount a power strip with AC to Edison adapters and Y-splitters.