You can probably google something like "suggested essential oils blends" and find some good info. But honestly, some people love blends that I can't stand, I love some that others think are downright weird, so the idea of "what smells good together" is honestly very subjective. It'd probably be best to learn about which scents serve as the best base/middle/top notes and use that+your personal preferences as a rough guideline when making blends.