Q: Activation

Hello machupa,

If you want to activate the cellular plan on your iPad mini you can actually do that on the iPad itself.

Activate cellular data service on your iPad Pro, iPad Air 2, and iPad mini 3 or later - Apple Support

If you are asking about syncing and setting up your iPad mini and not about setting up a cellular plan, please check out the User Guide,

Set up iPad - iPad User Guide

Take care.