OIl had been explained... but yes synthetic is fine. I use Motul or Amsoil. You CAN change it later (unlike what someone hinted to) but you do not want to MIX oils as in having amsoil in there, and topping it off with motul is a bad idea. Only use suzuki filters or K&N, I wont use anything else. DO NOT try to use a torque wrench on the oil drain bolt. You WILL strip it. Just tighten it good and tight.... doesnt have to be "squeaky" tight
Air filter, you need to remove the driver seat (two screws on the sides towards the front) Then remove the screws holding the tank down (near steering stem)
In your Tail section there should be a little funny looking bent rod. put the end that is bent at right angles in the steering neck, and the other end in one of the holes you took the tank mounting bolts out of.
Unscrew all the screws in the top of the airbox (dont miss the one in the middle)
Replace air filter and reverse instructions.
Lube chain AFTER every ride, not before as the chain will already be hot, and it also gives the lube time to set in so it doesnt fling all over the bike
Check the tire pressure BEFORE you ride... everytime.... I keep a gauge in my trunk.
Your tire pressure can change 1-2 lbs with every 10 degrees of temp change.
Be Safe