As a monk, whenever you do an unarmed attack or attack with a monk weapon, you can preform an unarmed attack as a bonus attack. If you have the thief subclass, you can do two of these if you stagger them: action attack, bonus attack, action attack, bonus attack.
You cannot use unarmed attacks for sneak attacks, but you can use daggers and short swords as monk weapons. Eventually, unarmed attacks with certain gear will put scale this, but in the mid game it is viable.
Unarmed attacks do not dual wield, but you can use unarmed attacks as bonus actions, so it doesn’t matter.