Are you a DMs Guild creator?
Then you could definitely use these style guides. They were first available only to official play writers but now they’re available to the broader public of the DMs Guild. This package includes a D&D House Style Guide, tips on adventure design by Chris Perkins and Greg Bilsand, a guide to the Forgotten Realms, and suggestions for how to use D&D IP.
To be honest, even if you’re not a DMs Guild creator, the tips on adventure design could potentially help you improve how you create adventures.
Check the style guide here. Did I mention it’s free?
And until next time, have fun!