What you did to become a videogame music composer? I'm composer and i would like to be a videogame soundtracker someday, but i don't know where to start, what to do, or who i need to talk. Good day.
I am a lifelong gamer and I think that's ultimately the best advice I can give. If you love the medium, you will naturally gravitate towards others who do and eventually some of those people will be making games of their own and needing a composer. In my case, I attended USC and met Jenova Chen who later founded thatgamecompany with Kellee Santiago. I worked on Jenova's thesis flOw, then the PS3 version of it, and obviously recently Journey.
I highly recommend you join the Game Audio Network Guild: http://audiogang.org They are a wonderful organization for game composers. And above all, try and attend the GDC (http://gdconf.com). It's actually next week so it's probably too late for this year. But they happen all around the world, though the main one is SF in March each year.
I hope that helps! Like I said ... if you really love games, you'll find work. I know that sounds idealistic but it's true :)