Hey,
I went to a firm right after studying because in Canada you're required to (it's called "articling").
I run a few online services and it's certainly possible to do that while working other jobs. Maybe you could build your service on the side and see if it's got legs?
I wouldn't recommend starting a law practice right out of school (if that's possible in your jurisdiction). It's good to get at least some experience/credibility.
I think it'll be tough to try to answer this post thoroughly so please feel free to email me at addison@cameronhuff.com if you'd like to chat further (email or Skype).