Hello and welcome to the forums!
Hope this helps:
1. Yes, you may exhaust any resource (and therefore a quest as well) the turn it enters play. Generally, only allies have to wait a turn before you can exhaust them to attack or use their activated (
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) powers.
Note that protectors may exhaust to protect even if they haven't "waited" a turn.2. Yes, you can complete an exhausted quest, provided you still have resources to do so. If you're in turn 3 and just played a 2-cost ally (exhausting your quest in the process) then you wouldn't be able to complete that quest if it says "Pay 2 to complete this quest..."
3. No, there isn't a maximum number (but you could only have only 1 card with Melee(1) in play, or more generally, only
N cards with
Something(N) in play)
4. Combat, follows these steps:
a) You propose to attack character A (opposing ally or hero) with character B (ally or hero of your own)
b) Character B exhausts and only now is he considered to be attacking (he is the attacker)
[Edited]c) The opponent may protect with a
protector, say character C (replacing character A as the defender in the process), by exhausting C
d) The attacker (char. B) and defender (char. A; or char. C if the opponent protected with him) are now in combat with each other;
it is also in this window here that char. B may strike with a weapon (if it was a hero for example)e) The attacker and defender deal simultaneously damage to each other equal to their respective ATK
Anywhere between steps a) to e)* players have a window of opportunity to respond to add something to the chain, that is they could play an instant card or use a power on an ally or complete a quest - that is if there weren't restrictions on doing so (an opponent could not use a power on ally that says "On your turn: ..." / "Use only on your turn" since it is not his turn; likewise he couldn't use an activated power of an ally that hasn't been in his party since the beginning of his last turn - see Answer 1).
If any of the characters A, B, or C would leave play before step e) (they would be destroyed, put in their owner's hand, removed from game) or change controllers, they are automatically removed from the combat and the combat ends without any damage being dealt between them. If B would be exhausted by something before step b) the combat ends likewise.
5. No, you could use it right away (exceptions are: a. if it has the activate symbol in the payment cost, in which case you have to wait a turn - see Answer 1.
b. if there are restrictions preventing using that power - see "On your turn" example if it's not your turn)
[Edit: ]
*My bad, you can't respond between steps c) and d), but there really aren't that many situations where you would want to do that, since you can still respond in the window between d) and e)
Also note that responding follows the priority rules: The player that last added something to the chain, (be it a combat proposal, a card or an effect of an ally power) retains priority until he passes it clockwise to the next player. Nothing resolves from the chain (that is, the combat proposal doesn't proceed to step b), the card doesn't come into play neither does it do what its text mentions, nor the effect of that ally power affects the game) if all players haven't passed priority without adding further to the chain.
On a normal turn, the chain is empty until the turn player adds something to it. He can play non-instants only on an empty chain (and outside of combat)For an in-depth rules manual see the Comprehensive Rules (CR), available at
http://www.ude.com/wow/rules