EDITING A THEME FOR PHOTOGRAPHY

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EDITING A THEME FOR PHOTOGRAPHY
I want to help my sister in Laws to complete setting up the this new them for her. I will purchase a nice theme for $39 and need to know what will cost for adding many details like:
1st. the theme need to protect the images from being able to download for free or by using the right button of the mouse over the image.
2nd. a login page where users could signup and purchase package of images by category and to the shopping cart.
3rd integrate the paypal system.
4th. create the ADMIN panel where my sister in law she can add, edit, delete functions to the back end.
the theme has the following details:
Compatible Browsers: Firefox, Safari, Opera, Chrome, Edge
Compatible With: Elementor, WooCommerce 4.0.x, WooCommerce 3.9.x
Software Version: WordPress 5.4.x, WordPress 5.3.x
Skills:
PHP
, WordPress
, HTML
, CSS
, Web Development

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