This guide will help you get a lot of money.
Making Money Guide
How to make a lot of money by mining
Pretty easy actually you just mine some ore and sell it its probably best if you sell the ore/bars but also you'll probably make more money if you trade with a player make sure to get a lot of it though or else one won't get you much money.
How to make money by trading
So this is like getting ore and trading but if you want money you might want to give them what they want or give them something really useful they could give you money.
How to make money selling stuff in the store
So this doesn't get you to much money but if you get like a really rare ore you can get a lot all you have to do is go to a store (best if you go to a general store) and right click the object and press sell now you can choose how much but you'll figure that out its really really easy don't worry.