Prestashop Website Developer

Hello everyone, I have created a website in Prestashop, the site is complete both in graphics and in the structure, but it needs a tune-up on a few things: Sometimes the selected product is not added to cart The form of payment paypal sometimes gives error. Insert other forms of payment online free like google checkout, moneybookers etc ... Check the correct operation of the forms of payment by bank transfer and cash on delivery. Properly configure the mail receiving orders. The form of the display should change the items randomly to access or every time you reload the page. I need the phone number field in the customer registration and that it is required and the tax code that field is optional. The site is currently located in a subfolder because I made a disclaimer page to enter, I have to move the site in the root and create a disclaimer page by clicking "I agree" and "Exit". I have a shared server and I need to use the media servers to speed up your site. We must improve the speed performance of the site. Check the operation of the server mamechached I reserve the right to request further amendments of minor significance. Nothing automatic responses to the project; indicatemi in your proposal your favorite food, otherwise the proposal will not be considered.