Draenei can have come from Draenor (you'd be very old) or from Azeroth. Argus, I think, would be far to ancient for any Draenei to feasibly survive, what with two genocides and a planeshift.
Also hard to justify a character from Argus still being level 1.
I don't think you need to be long lived to come from Draenor. There are still some that inhabit Outland. You could have time traveled as well, but I guess that technically makes you really old.
Yeah we're before Burning Crusade. You'll be starting in Stormwind, and I can guarantee that at least SOME events from the expansions will be featured in the campaign.
Sounds good, a lot of opportunity for interesting roleplay there. Out of interest, does he have a loathing for Orcs?
I'm going to assume Burning Crusade means Legion.
Elijin, it may be a good idea to check your skills against Urzamax's and see if you have any redundancies you could shift elsewhere, or ask him to shift. For example, you're both trained in Insight, when a party really only needs one character with good Insight (and Mown's priest is likely to have good Insight as well). You or Urzamax could take another skill like Acrobatics or Dungeoneering instead.
I think I might end up taking various Lore skills instead, since my intelligence is pretty good, I don't think we have any other scholar-type guys, and it lets me leverage my game knowledge.