I'm certainly no expert, but I've documented my own process for writing and publishing content on DM's Guild, and I hope that my own experiences can off you some insights into what can be a confusing process.
DM's Guild Resources
The following items are content which I have published on DMsGuild.
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Character options for playing every monster in the monster manual. Featured on [Kotaku](https://kotaku.com/d-d-player-mods-hundreds-of-monsters-into-playable-char-1821776481), and an Electrum Best Seller on DM's Guild!