I plan on making a video game?

In all honesty, the game would have to be pretty amazingly fantastic to get sponsored by big companies if you're only 14. I imagine a trailer like that would be thousands (maybe more, depending on the maker). Are you planning to code it or are you planning to get others to code it? With the programming, advertisement, distribution, modeling, texturing, voice acting, writing, etc., a big game costs tens or hundreds of millions to make.