I think the way to make good money is beginning a dwarf char or th/aw/pw cuz theese classes have nice abilities to make you rich(spoil, craft, opening boxes and etc).But the real way is to use your mind like a businessman ingame llike investing money for something another.
Example:you shout to buy item for low price and if you play in server with many ppl, you will find a "noob" guy and get the item from him(you can meet such a guys on the private stores too), so you will sit to sell this item with 50-100kk higher price!