Hi
You do need the user manual.
You need to carry a small pair of scissors to cut a longer leader tongue, with the longer leader it should load correct every time, without loads of problems.
You dont need to use any of the intraweb bodges for loading they are each likely to damage your camera.
Get a blower bulb and blow out the interior with the camera in normal landscape mode, the shutter should last several decades between any maintenance with some use, with hard use longer. The shutter can fail on a film chip...i
Dont worry about the finish Ive only ever seen one IIIC with intact chrome, the black stuff can chip possible to salvage this, instructions on web.
The early lenses need hoods Leitz ones are expensive.
Noel