You have two bolts under the seat to remove. Then lift up the back of the seat and pull backwards.. If you hear a popping noise it's just the suction cup that holds the front down.
Most people use 10/40 unless they live where it's hot then 20/50.
If you change from dino oil to syn you may develop a base gasket leak on the left front.. "I know ask me" It takes 1 quart. Clean both oil screens.
2 z-fittings, one on each side of the pivot point on the swing arm.
Check out your chain. You should at least give it a good cleaning and lubing.
Make sure you have some adjustment left on the adjusting snail.
Tire information should be on the label on the fender.
If you go with a paper filter make sure it's the correct one.. It must have "4" holes on the end...
Read all the pinned section on maint service page. Very helpful.
Good luck and have fun. OMM.