I would like a step by step procedure on.

Turn piston away from TDC and remove the valve cover. Inspect all valve clearances and if any are excessive large, you would need to take the head off to replace the valves. Start with this first.

The valve clearance is checked with cold engine, which is not a problem now.
Intake - 0.25 mm
Exhaust - 0.30.

Bent valves would have them at more than 0.50 mm

Let us know how it goes.

Timing belt is definite but valve job you can still hope that nothing is damaged as engine speed and how the belt gave way can still result in no damages.

If you are DIY, it is ok but if you are in the vehile repair business, replacing a timing belt is as common as a clutch job so you need to upgrade yourself on that. Timing belts have been phased out in many newer vehicles with chains and that would be more of a headache where work to be done is concerned. Good thing is timing chains have a longer lifespan and lesser maintainance but the damage is going to be much more than a bad timing belt.