Build an Online Store

I have my wordpress website with my own domain. I wanna keep it as it is and I want to have a new page/post of web shop in my site to sell my images by using woocommerce plugin. I know it needs some modifies in CSS. a page/post with 3 columns to sell my [login to view URL] has to be somehow that customer can choose, see the photo in original size with watermark ( no idea that woocommerce makes that watermark or I have to do it myself) and after purchase he/she can download via webshop or sending the image to them by email or even both. you can check the attached file to see what I want (but selling materials are downloadable images).