2010, 1st gen iPad 1 cannot be upgraded past iOS 5.1.1.
You need an iPad that can accept a more recent iOS version, you will need to purchase a new or newer (used) iPad model.
The new 2017, iPad 5 is THE cheapest 9.7 inch iPad Apple has ever made with full up to date spec.
See here.
https://www.apple.com/ipad-9.7/
Good Luck to You!