I want to have a directing career for nickelodeon because Dan Schneider and Victoria Justice inspire me.?

There would be no point moving there at the moment - or even for very many years!
First, you'd need many years at a good acting school and also acting experience with a reputable community or youth theatre. All directors can act, and have been trained and have experience. How could you expect to get respect from the actors you'd be directing if you couldn't do the job yourself? All good directors can demonstrate how a word, a line or even a whole scene should be performed.

And as you become more experienced at acting with your theatre group, you'll probably be allowed to assist the director, and eventually direct plays.

After high school you'd need to take a degree at university in Film Making/Directing.
By the time you've graduated, you'll know a lot more about the world of acting and will have made some good connections, and maybe then you could consider moving to LA.

Do make sure you also get trained for a 'ordinary' job as well. Almost all actors and directors are unemployed for 50 weeks out of 53 every year, so you'll need a way to earn a real living - or you won't be able to afford to live in LA.

I have worked for MTV years ago on "Remote Controll" and we used the same studio in NYC where they shot the Nickelodeon show "Double Dare." While their headquarters are still in NYC, I know many things are done in LA and some still done in NYC. Nickelodeon is not theater or film. It is TV and to direct you need video skills which are taught in college programs. You won't learn much from community theater or taking acting classes and not ALL directors are actors as stated. Grab a camera and start making your own videos. Learn as much as you can. NYU Tisch has a 4 week high school summer program where you can learn a lot and might help you gain some skills that can help get you into a good college program http://tisch.nyu.edu/special-programs/high-school-programs/filmmakers-workshop

Hope you get to check this out as I saw your question after you chose BA.

If your school or community has access to video equipment, it's a good place to start. Learn how to write a good story, not just some random idea you think would make a good film, merely bc it's your opinion. Good films are those which show us something in a way which hasn't been done before, or tells a tale with a new perspective. Some of the films in the Cannes Short Film Corner are a good place to see how they do that.

If you do well at it, which is a matter of tons of practice, rewrites, learning the way to film properly, etc. then you *might* in time get a name for yourself, and that can attract the professionals to your door, so to speak. Moving to LA unnecessarily is a waste of time and money. You'd then be competing against thousands of other people doing the same thing.