New or used?? Will make a little difference.. but not much really.
Here is the thread I put together regarding my 2013 setup. Obviously not all is required, but regardless its not a bad thing to add whatever protective gear you feel is necessary (personal preferences at play), check the the carb and jetting specs, check the main bearings for grease and play (lube in the right places will extend life and make the bike easier to work on when due for maintenance later). I'd ride it for a while before worrying about suspension - it gives you a baseline to work from.