In regards to question 4: Don't.
I make lots of gold simply playing the auction house and checking the trade channel for good deals. Specifically, look for stuff that has no sell price to vendors, that way you can put them back up for the full 24 hours without any deposit, so you don't have to worry about conserving money to afford AH costs of putting goods up. From 100g, in about 1 week I am almost half way to my epic mount and have not done an ounce of farming.
Also, if playing the AH isn't your fancy, try farming winterspring elites for the Eye of Shdaow. I did this a few times on my mage and made lots o gold.
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