I am 12 and I want to get into video game development and I am wondering how I should start

Start with a good computer, get a program that can do 3d stuff(might cost you a bit for both), try to think of an idea, when you got one make characters for it on the 3D program, get something that runs this 3D program and see how it works, then burn it on a disc(any but i suggest blank DVD-R), and (maybe) mail it into someplace and/or get a job application for that company, and there you go.
Now if you want to make a 2D game it is easier but i don't know of any things to run it on. First go on paint and make characters, their movements and stuff you want, maybe use pivot to see how it works(might take you a while though), burn it on disc(DVD-R), send it in/ get a job application and bring it if they accept you.

Now this is when you get to be 16+, but you could practice making games so that when you are old enough, you can make a really great game!