How sync iPad Iphone w/o computer

Both your iPad and iPhone must be signed-in to iCloud with the same AppleID. 

Sign in to iCloud on all your devices - Apple Support

Having signed-in to iCloud, you can enable services and Apps that you would like to synchronise between your devices:

Settings > [Your Name / AppleID] > iCloud

The iCloud User Guide provides comprehensive information:

iCloud User Guide - Apple Support

System Settings>Apple ID>iCloud and turn on the apps you want to sync.