The reason people make up combos so easily is because they set up certain ninja that can follow the move that they do. For example if you look at your ninjas you may find an attack that does high float. If you click on the thing that says "Pursuit Status" you can go under "Pursue High float" what that does is shows ninjas that will attack right after someone uses high float. You can make pretty long combo chains if you have the right ninja. If you still need help I suggest watching the youtube video "Naruto Online : How to build GOOD Teams and Combos"