#1
do you use your wrist or forearm when picking

do you use your wrist or forearm when strumming
#2
You should be using your wrist to generate the movement that strikes the strings and your forearm to keep your wrist at a good position to the strings you want to sound. You can be much more loose about it when you're strumming full chords but the general principle still applies.

There's a point in this video where Guthrie shows you roughly how this works:

https://www.youtube.com/watch?v=RlePTeNihp4

About 5:45 I think.
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#3
Tremelo picking - wrist definitely
Strumming - a combination of both

You want to be able to play what you want for as long as you want, so there is no point in using a technique that will tire you out in 30 seconds. Go for a relaxed and fluid technique which you can develop by experimenting and then practice it over and over to develop your stamina.
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#4
Great video link. If we should listen to anyone out there about technique it's mr Guthrie.
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