Welcome to the community!
Great to see you sharing ur work 
Here’s a clear breakdown from start to finish:
Step 0 — Understand what an Umbraco package is
Before diving in, it’s worth reading the official Umbraco overview of what packages are and the different types:
https://docs.umbraco.com/umbraco-cms/extending/packages
Step 1 — Create and pack your NuGet package
The first thing you’ll need to do is turn your project into a NuGet package. Umbraco has their own official guide on this which is the best place to start:
https://docs.umbraco.com/umbraco-cms/extending/packages/creating-a-package
For the general NuGet packaging side of things, Microsoft’s guide is also very useful:
https://learn.microsoft.com/en-us/nuget/quickstart/create-and-publish-a-package-using-visual-studio?tabs=netcore-cli
For a real-world example of how a .csproj looks in an actual Umbraco package, you can reference this one:
https://github.com/ZAAKS/Umbraco-Tag-Manager/blob/main/TagManager/TagManager.csproj
At a minimum, your .csproj should include something like this:
xml
<PropertyGroup>
<PackageId>YourPackage.Name</PackageId>
<Version>1.0.0</Version>
<Authors>Your Name</Authors>
<Description>A clear description of what your package does.</Description>
<PackageTags>umbraco-cms umbraco-marketplace</PackageTags>
</PropertyGroup>
Pay close attention to the PackageTags field it’s essential for the next steps. Once your metadata is in order, build the package with:
bash
dotnet pack --configuration Release
Step 2 — Publish to NuGet.org
Once your .nupkg file is ready check bin/release , publish it to NuGet.org. You’ll need a free account if you don’t have one:
https://www.nuget.org/
Then push your package using:
bash
dotnet nuget push YourPackage.nupkg --api-key YOUR_API_KEY --source https://api.nuget.org/v3/index.json
Step 3 — Get listed on the Umbraco Marketplace
This is the official Umbraco guide specifically for getting your package listed on the Marketplace — don’t skip this one:
https://docs.umbraco.com/umbraco-dxp/marketplace/listing-your-package
And the CMS-side companion page:
https://docs.umbraco.com/umbraco-cms/extending/packages/listing-on-marketplace
No manual submission is needed. As long as your NuGet package includes the umbraco-marketplace tag, the Marketplace will detect it automatically within 24–48 hours.
Optionally, you can also add a umbraco-marketplace.json file to your repo to provide richer information such as category, documentation URL, screenshots, and compatible Umbraco versions. The listing guide above covers this in detail.
Step 4 — Validate your listing
Once it appears, use the official validator to confirm everything is displaying correctly:
https://marketplace.umbraco.com/validate
This will highlight any missing metadata or issues before you share your package publicly.
Hope that helps clarify the full process!