what server/region are you playing on?
well the obvious way to make tons of gold is botting but as always you run the risk of getting banned and even keylogged
you can grind and make gold relatively fast legit on a couple of places when you get 50+
moneymaker class
for solo play anything + priest/druid as secondary is good to start off with because it allows you to heal yourself and you still have your 3rd class to pick up
if you are playing on smacht(EU PVP server) i could probably help u