I think Anastasios did a good job at answering the question; the only thing I'd say differently would be regarding this:
3) Is the bishop ordaining the candidate in communion with the other Orthodox bishops?
This is normally true (but it is vague since who is "Orthodox" can change over time). There are exceptions to this rule, though. For instance, if the bishops that are ordaining are unable to be in contact with or be in communion with the "other Orthodox bishops," there actions might still be valid. If an area is run by Muslims or Atheistic Communists, for example, communications with the Orthodox outside their area of control might be either difficult or impossible. Also, if the majority of the "Church" is in heresy (e.g., what happened with Arianism), an observer who was "outside looking into the Church" might think that the Catholics/Orthodox weren't in communion with "the other Orthodox". Of course, the Catholics/Orthodox would instead only be proctecting their flock.
This last part is significant since the Fathers teach that at the end almost all the world--including most Orthodox--will fall into error. At that time (which I don't necessarily claim to be our time), those true to the Orthodox faith will not be able to "be in communion with the other Orthodox groups," simply because there won't be many other Orthodox groups. So why do I mention it? Because Satan is now trying to trick people into thinking that if you aren't recognized by some pre-conceived "official" body (or enough "Orthodox groups"),. that you aren't Orthodox. When anti-Christ comes, this will make his job all that much easier, since the majority of people--including Orthodox people (after all, the majority of Churches are made up of people who aren't what you might call "on fire" for God, they're there for other reasons)--will fall into his trap. The ones who have doubts, having only heard the warped ecclesiology about the necessity of being in communion with other Orthodox, will believe that they must join the world wide "Orthodox Church" at that time, since in their minds to leave it would mean that they aren't in the Church at all.
PS. Also remember, regarding apostolic succession, that God can work in whatever way he wishes. Selling offices is not
defendable, but on the other hand, God can use even such men for his purpose (we see examples of this in the OT Patriarchs, do we not?)