Still not clear ?
Here is a simple checklist
Make access to the clock easy. Put in good lights, and make the ladders etc safe.
Keep the clockroom clean, take a hoover up once a year.
Lubricate the clock twice a year.
Wind it regularly.
If the clock is electric or electronic put some money aside as the new electronic clocks last as long as your desktop computer.
Every time you have scaffold to the roof or similar, ensure you clean the dial and lubricate the hands.
Clockmakers are a dying breed, if you find a good one, keep him and do not tell any one else.
Do not try to do heavy clockmaking work, call in a professional firm and be prepared to pay the same as you would for a top class car service and allow for exterior access to double the price.