Here's how to make lots of money! This one is possibly the fastest way to earn a lot of coins.
Step 1: Buy 30-99 Gold Nuggets at a Trade Portal
Step 2: Craft Gold Ingots from a Furnace
Step 2 (bonus): If you can, craft Gold Blocks from a MB (metalwork bench)
Step 3: Sell them and earn TONS of money! This is the easiest and fastest way to earn lots of coins known to man. It even fits an entire chest!
If you need help getting coins, ask me!