I'll give it a try...
What seat does SO sit, left or right?
In the back during T/O and Landing.
During cruise, I think it depends on who you are working with. If you are flying with the captain then he sits on his seat and you sit on the RHS. If you are flying with the relief F/O then you sit on the LHS while he/she sits on the RHS, as the RQ is trained to perform relief command only from the RHS.
Where does B777-200 fly to?
Around Asia.
What is the definition of long haul, medim haul of CX route?
Not sure. My guess is that anything above 8 hours is considered long-haul. The whole issue of flight duty times is quite messy though, as you can see from another thread in the neighbouring Fragrant Harbour forum. Perhaps someone else in the know can answer your question.