Oil change is simples. Just drop the oil, unscrew filter and replace. Fit sump plug with new copper crush washer supplied, and refill with oil.
Gearbox - Undo filler plug on side first, then undo drain plug. Refill with gear oil and tube of molyslip.
Spark plugs will need replacing at that mileage, and you might want to change the diff oil while you're at it.
PM Clark M/S and they will supply exactly what you need