I say go for it. Bleacher Report is where I first started out five years ago, and I knew nothing about journalism, just a lot about football. After a while I realized that sportswriting was for me, so I applied for a journalism degree at my local college.
I've worked in some big newsrooms over here in Australia, which can be daunting, but it's definitely where the action is. For now though, go ahead and publish some articles here, I don't think there's any better place to get your name out there!