The suspension is already somewhat sorted, but you should set the sag for your weight and make sure that it is all adjusted correctly as people who don't know what they are doing have probably turned a few knobs.
Check the map and see if it is canned one off the dynonet website. If it is, get the bike tuned, but do the soft rev eliminator first. Also ensure that the flapper and pair mods have been done and change the spark plugs since you don't know how old they are. Even if the guy told you, it is only like $20 and if they were bad, you will be able to tell just by feel after you change them.
Then: trackdays, trackdays, trackdays.