How do I control an Actor from Player Controller?

If i want to handle input in the blueprint of the Player Controller, how do i access an actor in the Level? Or what is the best practice for handling input?

Check out some of build in template, such as Third person, Top down or First person mate. Basically if you want to control an actor, you only need to possess an actor with your current controller, write the code and function for receiving input inside your custom controller, then either you put the code that handling all those input inside your controller, or if you have different types of actor that will behave differently using the same input, you may want to put the handling code inside each of them actor blueprint.