Sandwich for embossing folders is flipping open the first page of the platform that came with your machine. Opened platform, Clear plate, embossing folder, clear plate
Sometimes it's your paper with embossing folders. Some are more brittle than others.
The Carved Ornaments die will work with the clear plates that came with your machine. Clear plate, die, paper, clear plate.
For the strip die you'll need:
Sizzix.com - Sizzix Accessory - Extended Spacer Platform
Or these (these will work for strip dies AND the longer dies - BigzXL) :
Sizzix.com - Sizzix Accessory - Essentials Platform
Sizzix.com - Sizzix Accessory - Cutting Pad, Extended, 1 Pair