— Well, first of all - find the right team. My first attempts in filming were not successful because I haven't found the cameraman that had the same vision as mine. Since I started working with Tsvetomir Petrovski (the DOP of all my short films), a very talented cameraman, I am absolutely sure that he will make a shot as close to what's in my head. As one of my teachers in directing, the famous Bulgarian director Georgi Dulgerov said, "Finding your DOP is the same as finding a boyfriend!" It turned out to be true!
Another advice from me - marry an actor! Then you will have as many actors as you want working for you for free! I'm kidding, of course, but that doesn't hurt! Actually, my husband is a theatre actor and director and we watch a lot of theatre which is really helpful - you can see a great deal of the actors' potential on the stage and it helps you give them more complicated tasks before the camera.
And something that was absolutely working for me - have a really short period to make a film. Whenever there was some kind of film challenge or contest, I joined! This is a sure way that you have to start and complete a film even if you're not sure exactly what will happen or you don't have the whole idea ready in your head. Directing is the only way to learn how to direct! Good luck!