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Pick ‘em off one by one, it's easier! Domain names will usually sell in a one-off situation. Packaging up domains together to sell them in bulk may dissuade a buyer who would rather have one domain for less instead of your whole selection. Also, over time, you will make more selling your domains individually.
If you want to sell a mass of domains, there are ways to bulk-list those domains with a “domains for sale” website (though, again, they would be purchased one-by-one).