How do you apply for auditions through the TV industies as an actor

thank you to kime for the above comment.. it was very informative and helped me out a lot. Im 15 and i am a member of my local theatre, have had 6 years dancing experience and 5 years of singing and acting. Ive only just finished my first musical and plan on being in many more but would really like some more experience other than the stage as well. How can i get this? Other question is i often read above that its wise to find an agent that doesnt require an upfront fee, could i get some examples? I know about frog but they charge a fee for their course. I am really interested about getting into some tv commercials because i hear that that's good experience but im unsure of the best way of doing it. And also how to write a good cv. I'd just like to say a massive thank you to all the learned people who have helped out beginers like me by taking the time to write these comments... its very much appreciated