The difference between a good character and an evil character is that the evil character is willingable to do thingssolve problems in ways the good character can't because it would be "wrong".
You need an information from an NPC? A good character would be limited to asking nicely and doing them a favor. But as an evil character you have the options to use intimidation, threats and torture.
Your caravan meetmeets a trader who sells something they need? A good character would ask "What's the price?". An evil character would ask "How strong do their guards look?".
As an evil character you are also not expected to do anything for free. While a good character is expected to do certain things because they are "good deeds", whenever an evil character is asked to do something, they have the right to ask back "What's in it for me?".
When no such opportunities occur, for example because the campaign goes more in a hack&slay direction, you could actively seek to initiate intrigues. You could, for example, persuade one of the traders to pay you for murdering their rivals. They don't have any rivals? No problem. You just forge some evidence and persuade them that they do.