You've got a clean slate which is great. Look at all the different styles of touring from 4x panniers with handlebar bag, to 2x small panniers with handlebar bag and finally the bikepacking setup. The direction you go will be dictated by the bike you want to use and your personal preferences.

If I was starting I might opt for an Ortlieb hanndlebar bag and a couple of Arkel Dry-lite panniers.