Were can I buy a charger and cord for my new iPad mini

If you lost those or need to replace them for some other reason you can buy them from Apple online in the U.S. -- see:

Buy 20W USB-C Power Adapter - Apple

and

Buy USB-C to Lightning Cable (2 m) - Apple

The new iPad Mini comes with a cord and power adapter. See the following from https://www.apple.com/shop/buy-ipad/ipad-mini

What’s in the Box

• 
• iPad mini
• 
• USB-C Charge Cable
• 
• 20W USB-C Power Adapter