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InDesign doesn't ship with those kind of templates anymore but you can find some old ones here: https://indesignsecrets.com/resources/indesign-templates
You might find the following useful as well:
Things to consider:
Is the book cover for a paperback style book or for a loose jacket with flaps?
Do you know the trimmed page size of the proposed book e.g. A5 (148 x 210 mm)
Do you know the spine width (this will depend on the number of pages in the book and the weight of the paper – your printer should be able to calculate it).
Will your cover pictures bleed, if so, do you know what bleed is?
Is the cover to be printed in black and white, 4 colour or what?
This is a good tutorial (source: Ellis): https://indesignsecrets.com/indesign-secrets-video-laying-book-cover.php
And as you're an InDesign beginner you'd be strongly advised to take a tutorial such as those on Lynda.com. and TrainSimple.com
There are also some excellent books such as