Noticed a little oil around the exhaust side, might as well replace the head gasket just to be safe. Apart from the Head gasket, would I need to replace other gaskets as well?
inlet valve seals, exhaust, inlet, half moon, camshaft oil seals?

While the head is off, what should I do? replace the valve stem, hydraulic tappets and what else?

It's my first time taking the head off, so I don't really know what to replace, the car has done just over 60k km. The tappets are a touch noisy after I used some 5W50 engine oil. Any suggestion will be a great help, thanks!