-You have to have reached 150 hp.
-You gotta have a weapon that can give 20 dmg with a speed of medium fast.
-You gotta have 10 armor.
You make a small world and make a shelter for the guide and make 10 torches.Then you find the corruption, and make a shelter where from you open you`re door and kill every monster coming.
When you have done that for a (ingame) day you will have obtained 25-125 silver depending on how effective you have been.