Welcome @Susan Fuller
Trello’s docs explain that when you add a checklist to a card, you can choose to copy items from an existing checklist on your board using the “Copy items from…” dropdown. This is the core way to duplicate checklist items between cards.
https://support.atlassian.com/trello/docs/adding-checklists-to-cards/
Below doc covers how you can copy entire cards (which includes checklists on those cards). It also mentions that when you add a checklist, you can copy items from other checklists on your board.
https://support.atlassian.com/trello/docs/copying-cards-lists-or-boards/
Hope it helps you copy your first checklist :)
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