just purchased a 1gen apple pencil for my ipad pro 12.9 first gen and will not work i have tried everything

If you already performed all the steps provided in this support article to no avail:--> Use Apple Pencil with your iPad or iPad Pro - Apple Support

that accessory might be faulty. Contact Apple support using this link:--> Get Support

Regards

Giulio

This troubleshooting guide for the Apple Pencil might be helpful:

https://appletoolbox.com/apple-pencil-not-working-heres-our-troubleshooting-guide/