Received new 2017 apple ipad for Christmas. Never used it.. want to sell

You’ll get some idea of the value of your five year-old iPad model from Apple’s trade-in portal:

Apple Trade In - Apple

Assuming that you are looking to sell privately, you might consider this value to be the “bottom price”. You might also look at some popular auction websites - looking for the value that equivalent models are reaching for resale.

Find out your model number, it should be on the box, and then go to a website like eBay and see what people are willing to pay for an iPad of that age.