I am not sure you will find a tutorial on set ways to lay out UV's Since every model or project has different requirements.

The general guidelines are the same though, you should consider things like amount of time on and distance from Camera for example ( is your piece a hero object/character or scene fill).

If the model is going to be close to camera you need to dedicate more UV space to the texture.Things like final output resolution and therefore texture resolution also make a difference.


It is really about using as much of the 0-1 UV space as possible while trying to make the things that need the most resolution have the most space and placing items in areas that make sense to you so as to make texturing easier...see this thread for more help

https://simplymaya.com/forum/showthread.php?t=28268