If I am flying in from Costa Rica to Atlanta and then changing planes to Raleigh, NC do I have to change to a domestic terminal?
You don't actually change terminals. You will arrive in Concourse E/F, go through US Immigration, claim your bags, go through US Customs, re-check your bags at the re-check desk, then go through security and take the Plane Train directly to your departure concourse.
I am flying back to the US from Delhi on Delta Code Share Flights with 2.5 hour connection. When I arrive in AMS do i need to claim my checked bag and then proceed through security? Flights are DL7535 and DL73
You don't have to do anything with your checked bags. Just go through security and to your departure gate.
Which form must I complete when declaring funds over $10000 euros please
You need to go through the red lane when you arrive in Amsterdam if you are entering the EU with over 10000 Euro and go to the Office Tax Refund / VAT Refund desk if you are leaving the EU with over 10000 Euro and Amsterdam is your point of entry/exit. https://www.belastingdienst.nl/wps/wcm/connect/bldcontenten/belastingdienst/individuals/abroad_and_customs/restricted_prohibited_import_export/10_000_or_more/declaration_liquid_assets/filing_a_declaration