I second podlings advice. I think the most important goal of the first two years is to rock step I. The best way to do that at this point is to do well in your classes now and get good grades. Don't worry about studying until classes end in May.
I also think that getting involved in research is important. It's a great way to meet attendings and you'll have something to put on your application, to talk about at interviews, and you may even get a publication out of it. Use some of free time to hang out with the residents if you have an ortho program at your school. I've found ortho residents to be some of the coolest people to learn from. They are always willing to teach you if you show interest and they know how to enjoy their work, as opposed to their gen surg counterparts. But don't let any of this get in the way of your studying to do well on the boards. I'm only a third year, but it seems like the greatest obstacle to getting an ortho spot is below average step I scores. But the residents out there can comment on this better than I can. )