First of all, not all of those can actually be used on a weapon. For instance, you can't 'deafen' or 'blind' a weapon. Plague, poison, weaken, curse are the extents of what you can pimp it with.
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Can you "pimp your blade" if it's in your inventory? Or only if you're wielding it?
You can do it in your inventory as well but at times that has been..buggy with the blade applying the debuffs to YOU when you wield it.
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How long do the debuffs last if you don't use your weapon?
2 ticks.
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If you use your weapon, is it gone after the first attack?
It's gone after the first -hit-
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If your first attack misses, are the debuffs still gone?
See above.
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Is there any difference in success chance when comparing the spell being cast directly on the target, and into the weapon which hits the target?
I don't believe weapon debuffs use your art, although don't quote me on that.