You need a reference to the Actor, not the class name. So if the code is in the Dodgethis class, you can just use 'this'. If not, then you can use the 'getObjects' method in the world class and get the first element (if there is only one Dodgethis in the world).
The last task can also be done with the 'getObjects' method. Then you can check how many elements are in the list.