Revolvers are not intended to be disassembled by the user for regular maintenance and cleaning. Would strongly recommend you find a qualified pistolsmith if you need work done. Spray gun cleaner can clean internal lockwork without taking it apart.
about 1973
Colt data at Proofhouse.com
No serial number provided.
Around 1973.
1958
100-500 USD
Between 1971 & 1972
Can't be answered without the serial number.
-5-500 USD or so
It will be marked on the weapon.
Impossible to answer without the serial number.
your colt trooper mkIII was made in 1978.