yaya, during the first 2 years you should concentrate on learning the material for classes and do well on your exams. This will also prepare you to ace boards (hopefully).
Research is always a plus! It really dosen't matter if you do clinical or bench. If you get involved in a study make sure you understand what you're doing and be able to discuss it... this will play a role in interviews!
If you can make time to follow an orthopod then by all means go ahead and do so, but not at the expense of your academics. One thing you shoud do early is get to know your program's chairman. This person can be a great resource over the next few years. Besides, the better he knows you, the better LOR he can write for you. Good luck and study hard!