Grams and kilograms are measurement of weight. For a letter you would use grams. For a package you would use kilograms as it weight is more.
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I would use grams because grams would give you more significant figures for the measurement than kilograms
Probably use kilograms, they're bigger than pounds. Most other countries use kilograms. Example: I weigh 120 pounds, which means I also weigh 54 kilograms.
I would use a postal scale to weigh the letter. Once I knew the weight, I could express it in any unit of force, but 'grams' would probably result in the most convenient number.
paper clips do not weigh much, perhaps a gram each, so 10 weigh about 10 grams, so you would use grams, not kilograms, since 1 kg = 1000 grams
As far as I can tell there is no such thing as a canalop! So it does not matter whether you use grams or kilograms - the measure will be zero in either case.