Complicated (to me) Shipping Setup

I have a site where I need to setup the shipping like this:

we should have this menu for one product:

• Flat Rate USPS Shipping to the US (3-4days)..............................$6
• Flat Rate USPS Shipping International (6-10days)......................$13
• UPS Second Day....................................................................$x (calculated)
• UPS Next Day........................................................................$y (calculated)-and this one for two or more products:

• Free USPS Shipping to the US (3-4days)......................................FREE
• USPS Priority Mail International (6-10days)...................................$x (calculated)
• UPS Second Day......................................................................$x (calculated)
• UPS Next Day..........................................................................$y (calculated)
  

Can anyone help me figure out the best way to set this up?