I suggest to finish all the quests first. They give you nice rewards and gold. After that, if you have gold shortage, you can do "flame" runs - you will see that there will be a flame above one of the dungeons - 3x price for the boss trophy. Also, prep "Bet on Boss" to earn more gold.
Or you can do dungeons you know how to finish quickly - with "Bet on Boss" also.
If you prep "Vicious Token", it will add extra gold if you win.
There are some nice combinations of class/races to clear certain dungeons. For example, Orc Monk of Taurog with Whurgarbl is ideal to clear Magma Mines with Vicious Token. So you can "farm" this dungeon once you are familiar with tactics and get ~1k gold every time

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