how to get new passcode to set up new ipad

A new iPad should greet you with a hello screen - and in following the set-up process you will set a new Passcode. If instead you are challenged for a Passcode, the iPad is has been previously set-up by somebody else.

You should return the iPad to the point of purchase for exchange - as you’ll not be able to resolve the problem.

When initially setting-up a new iPad, you should be able to follow this process:

Set up your iPhone, iPad, or iPod touch - Apple Support