add some simple functions to wordpress/woocomerce site

i am creating a website for my client, but i am late, and i still have to do some work, i need help to add some simple functions : website url : [login to view URL] 1. in top bar i need to add Wocommerce cart, i don't want it in the main menu (the theme does not have this option in menu setting, and also search 2. in this page [login to view URL] i want to use a javascript code to display the total in real time (product price * number of products) note there is only one product 500€, and this will be a product page so when click the button it should add the product to cart (woocomerce database) 3. in the menu -- Mon Compte => Commande en cours -- this is checkout page, you should get the number of products in the cart and display it in the table; if there is no product it should display a text with a button; what i realy need is get the number of product in cart from Data base 4. in the menu -- Mon Compte => MON PORTEFEUILLE -- you should get the number of products that the user has already bought