These are the most common checks at that mileage:
Change oil and oil filter
Valve clearance check
Check timing belt tension and condition
Check air filter
Check brake and clutch fluid levels
Adjust and lube whatever needs it.
Check chain/sprocket wear
Visual check for leaking fork or shock seals.
Tire wear and pressures.
Battery charge and fit. Check cables are tight.
Inspect or replace brake pads and discs
Check fuel lines, lights and generally all nuts, bolts
Check general operation of switches, kill switch, side stand
switch, clutch switch.
Check throttle body condition.
If you are checking things over you can either clean
or replace things like spark plugs, clutch pack if
slipping and timing belts. These can often be
done around 24000 kilometers if okay.
Another good thing to check is wiring for chaffing
or rubbing through anywhere it looks tight.
There are also some helpful videos on youtube: