Website modification required in PHP and mysql

Dear Team

I need some modification on my running website,which is mentioned below.
Checkout function has to alter with some features like #Save multiple shipping addresses# Access your order history etc.flow chart file attached
Add international product ordering from existing website with seperate function mentioned on attached file.view flow chart

view website here http://testflr.emiratesflorist.com
Please check the attached file for flow,bids without understanding the idea will be rejected.
Payment will be done through 2checkout.com or Western uniun after completion and testing in your server or our server only.