Hi James!
I’m happy to read you’re liking the tutorials and find them useful.
To answer your question: I always create an armature based on reference material of the approximate body type I am going for with the initial sculpt.
Generally any person would work, of you can find an image of them in a so-called A or T-pose, photographed from the front with the arms either slightly out and away from the body (A), or stretched out to the sides (T).
Good sources are websites such as PoseSpace.com, because the have a lot of different models – male and female – that are not just shot in certain positions you may be interested in, but also usually at least one set that shows them in a neutral pose such as the T-pose.
And with images like these you can easily create an armature based on their body proportions.
As far as scaling goes it’s really not all that important, it really is about the proportions and to make sure that all the limbs have the correct length.
But whether or not your armature has very long or rather short legs, a regular or long torso, it all depends on the reference you choose.
I hope that helps, and if you have further questions feel free to ask!
~Lisa
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