It is very simple to select "Add Existing Files", navigate to the folder with all your images, and then highlight all your images (ctrl-a) and select "open".
Sigil will automatically put all of those images in your images folder in the ePub AND put the appropriate references in your Content.opf file.
I would recommend renaming the images to not have spaces. It doesn't have to be image001, image002...I prefer descriptive names, but with no spaces (Map_Hogwarts, Ch_art, BackCover etc.)
Cheers!
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