just got a used GZ, what should i look over maintenance wise

[dannylightning]

this is my first bike it is a blue 03 gz250 with 2900 some miles on it. since its my first bike i don't know every thing to look for, i have rode bikes before just never had my own so i could use some help here

so far i have adjusted the clutch cable, throttle cable, cleaned the air filter but probably should replace it, changed the oil, tightened the rubber hose on both sides of the carb, (the clamps were so loose i could move them by hand and it was leaking a little bit of gas), put air in the tires.

i know the chain needs tensioned, it has a pretty good amount of play and according to the manual it should only have about half a inch of play if i understand that correctly, it does not explain well on adjusting the chain but i assume it means that half a inch or so is all the further the chain should be able to move up and down when you giggle it??? i already know to look for tight spots and all of that

it ran good when i got it and it runs a lot smoother now,

what else should i look for that may need adjustment that a newbie can do their self, i am some what mechanically inclined but no mechanic
thanks

-Danny