Correct and improve the website

There is a website (landing page) on WordPress + HTML5 +CSS3+ JS. The site needs to be slightly redesigned: make the logo in the header smaller, make the "servicios" as a new page, remove the buttons for switching to social networks from the header, etc. The responsiveness of the site also needs to be improved. It is also need to add a page with products (supplements, I will provide photos of products) + a shopping cart that will allow you to change the quantity of the selected product, delete the added product, calculate the total amount with / without delivery, including VAT. The last step (that is, after choosing the quantity of goods and clicking the "request an item" button) should be to send the order to the seller's mail and notify the buyer that his request has been successfully sent and will soon be contacted and provided with payment instructions.. Details - in personal correspondence after determining the performer.
Long-term cooperation and new orders are possible in case of excellent execution of the task.