e-commerce templates for free?

Hi,
I am totally new to WP and know nothing about coding, html etc.
I am looking for a theme that comes with idiot proof instructions so can customize it to suit me.
I quite like this WP site https://www.whimsicalelements.ca.
and also this theme https://wpecommerce.us/wpa-storefront-free-download-test-demothe-ultimate-wp-e-commerce-theme-themeforest-wordpress-theme.html/
Ideally I want something like Whismical but with a dynamic content box at the top or maybe some box at a sidebar that can keep information always on top.
I know I maybe asking for much but if anyone could help I would be very grateful!!

Thanks

Caprizzosa