I've a high experience developing websites, in special because I always try to help the customer giving the best and easily project. After finish the website like you want, in all my projects, I do an easy admin panel to the customer, then you can do changes on the future and don't have to contract or pay me for that. In all my projects, when I finish, I do an PDF with all the details with how you can use the admin panel, and then like this, you have the freedom. Please, visit my profile to get my portfolio. I have high experience with e-commerce's, so I will give the best option for you, as WooCommerce or Magento, 2 ways to sell easy on the web.