Thanks for all the feedback. Well I have 3 players, of which one is a bit of a pain in the ass.
He is the most experienced one with D&D (also more then myself), and I expect him to play kind of backstabbing towards the other 2 lesser experienced players. That’s the way he thinks a evil character is suppose to be played. But I am hoping to have a fairly loyal party (toward each other), that is evil in its goals and ways in which they will obtain those.
An option maybe to integrate them into some sort of organized assassins guild. There they will be formed into a party and send on several missions, testing their ability to succeed. The better the missions are completed, the better their rewards will be. The most effective way for them to play will be by loyal teamwork. What do you guys think of something like this.