Enlarging product image w/ click + product clickthrough with arrows; making header images hero

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Hi all,

I'm using the Debut theme, which works perfectly for my site, but have a few minor hangups:

1) I'd like to be able to enlarge product images when clicked on

2) After being clicked on, I'd like arrows to appear to navigate through product images (an idea of what I'm looking for is here: https://prynne.shop/collections/siren-sais-1/products/vanda-indigo)

3) I'd like for header images to become hero images as on the homepage.

I'd prefer to edit code, though I'm new to Shopify's language layout, but if there are easy plugin fixes, please send 'em over. 

Thanks in advance,