Best and Faster One Page Check Out for last version of Virtuemart (Auto replies will be declined)

Auto replies will be declined, also inexperienced freelancers. Project intended only for specialists in Joomla and Virtuemart and also PHP, CMS, MySQL and HTML. The freelancer will provide a design in a new (not public) web page create with the last version of joomla and viertumart to be checked. The check out must be in only one real web page. I´m looking for the best option, intuitive and easy. Buying process: 1.- Access: new user and registered users. We need to show it a very easy way. When the customer choose, we will offer the corresponding options. We will offer two options when the users register: Country by default, Spain: I will provide all the Postal Codes, to be linked with cities and municipalities or small villages. I mean, when the user write the Poztal Code, the city and village linked will appear automatically. Also I can provide the street list linked to this Postal Code. Other countries of the UE, will be shown in a drop-down menu, below Spain, by alphabetical order. 2.- After register or fill out the form, the customers will choose the payment method. We will offer two options: External method: Paypal, Credit Card or Yupay: It’s necessary to redirect. Internal method: Bank transfer or bank deposit: we will show the payment details just below. 3.- Shipping cost. It will be necessary to configure the shipping cost of this two groups. In Spain with an ecommerce module provided, taken in to account the weight of the final products ordered. To configure the shipping cost for the EU countries, I will provide all the details. 4.- Also, it will be necessary to configure the payments methods to optimize all the process, I mean PYPAL, YUPAY, CREDIT CARD (its already working well), BANK TRANSFER, DEPOSIT… and others. Thanks. Miguel.