It is against the forum rules to post a link to free manual downloads, but they are out there if you look
Change the oil and filter, clean / change plugs, drain carbs (try this first before puling them apart) Fresh petrol and away you go.
If it is hydraulic brakes, think about changing the fluid. If it is drums, oil the cable inners. Also oil the clutch and throttle cables
Ask on here if you need more details