Redesign existing shopify store including product listing with necessary amendment.
Editing the theme code may be necessary for redesign.
Write a listing with proper keyword research (8 Products/3 are same with variations) for Amazon and insert in shopify store.
Tidy up the shopify store to launch in USA market.
Transfer domain from godaddy to namecheap.
Properly linked my amazon product to shopify store including FBA synchronisation.
Check and ensure existing T&C, Policy all related info is correct for USA lanuch.