How to become a successful actor
Don’t be scared. Get out there and audition. Try your hardest and have good posture. Smile and look like you are having fun.

Be confident. You are really important sometimes the supporting actor is one of the most important parts of a production … You’ll work your way up to the lead.
Express yourself. The main idea in being a good actor or actress is expressing emotion and what you’re feeling. Your audience needs to know what is happening and to feel about certain situations.
Learn to react. While not everyone agrees that acting is reacting, it is still an important thing to consider when you’re learning about acting. This means that you have to work on your responsiveness to any given acting situation.
• Engage yourself in your character’s world. React to circumstances and other characters as your character would.
• Keep yourself in the moment. Don’t try and start thinking ahead to the next scene, or agonizing about whether you said your lines appropriately in the previous scene.

Monitor your speed and volume. When reciting lines, it’s tempting to blaze through them as fast as you can. Be careful not to over exaggerate, though. Slowing down too much will make you sound robotic and will bore your audience. Think about how someone would actually deliver these words. Avoid yelling, project instead.
Play with emphasis. Think about the subtext of every line, and emphasize accordingly. It may not sound important, but emphasis can have a huge role in anything you say. I need you means something completely different than I need you.
Put yourself in the place of your character. You cannot adequately represent a character unless you can get inside their head. Even though your words are scripted out, your actions aren’t written in stone. In addition, knowing your character well will help you improvise should another actor forget their lines.
Think before you speak, so you don’t pull the whole “um” thing or stutter. That will bore your audience and make them lose interest in you.
Make body movements! Hand jesters are important. Your body and eye movement help you show the personality of the character. Anyone can read lines but bringing a character to life is your job as an actor.
Be aware of things that you do when you’re nervous. Avoid playing with your hair, hiding your hands in your sleeves, or shuffling your feet. Instead, calm your nerves by taking a deep breath and drinking some water. Reassure yourself that you’ll be fine.
Try to do actions someone would really do. For example, if you’re sad, show it in your eyes, not only your mouth and your voice. If you’re angry, tense yourself, glare, make it seem real!
Study your lines. If you don’t know them, you will freeze up onstage!