I'm in the same boat as you, and would love some info from freelance writers as well. One thing you might want to do if you haven't already is to start posting some of your writings around online, blogs, message boards, etc, just to have them out there and maybe have them noticed. I recently wrote an article for a PC game website I'm (kind of) working on, posted it on a game message forum to see what the reactions were, and ended up being invited to write for an e-magazine dedicated to the game series because someone saw my work and liked it. This is a far cry from freelance writing, but could make for a great example of work I could do if someone wanted to see it.
More than likely this is a totally obvious idea that you've already had, but sometimes I tend to think too hard and not notice the obvious things.
