Unsure how to set up this shipping method

-- url of the page with the problem -- : www.survivalbreakdownbow.com
-- HikaShop version -- : 2.6.3
-- Joomla version -- : 3.5.1

Hello,
My client wants to set up shipping for her product and even though she uses USPS, wants to set it up in the following way:

Domestic flat rate of $14
International would have the following:
- 1-3lbs package is $35
- 4-5lbs is $50
- 5-6lbs is $56
- 6-7lbs is $59
- 7-8lbs is $62

So I assume this will be a manual set up. Do I create a manual set up for each weight group, so that I would have a Domestic flat, and 5 different International? If that is the case, when weight is put into each item, will it automatically determine which country it is going to, and if international, which weight group it falls into? Or is there a better way to set this up?

Thanks in advance for your help.

Thank you!

Regarding the currency for the shipping rate, do I have to put in every currency of every country I have listed to ship to? I am based in the US so do I just put USD? Or do I leave that blank?