I have a iPad mini and would like to donate it to a special needs child, can I bring it in and have it erased so it doesn't have my password?

You can actually do it yourself if you can get to home screen. Just go to settings, general and then scroll down to reset.

Yes, but google it on how to do a factory reset. It will take you 5 minutes, is really really easy, and will save you 40$ from geek squad.

You can do that yourself best buy is expensive to do that. And employees tend to take any data they can and sell on the dark web. I've know a few guys that worked in tech repair.

Yes, but you can also do that yourself.