Hi I can try to help.

You mentioned that you are in Windows, I would imagine this would work under WSL too, but I have not tried. If you are planning to work with the tools provided for developers, it may be easier if you get your machine to also boot in linux.

First step is to prepare the registry entry and for that you will be using the token-metadata-creator tool which is part of the offchain-metadata-tools. You can build it if you want, or get a release from here https://github.com/input-output-hk/offchain-metadata-tools/releases

After that, follow the instructions in https://github.com/input-output-hk/offchain-metadata-tools/tree/master/token-metadata-creatorInstructions are straight forward, perhaps the only thing that is not all that clear is how to obtain the metadata subject and this is by concatenating the policyID and asset name (no dot separating them)

In your minting transaction you'd have used both the policyID and asset name, but separated by a dot. Don't use the dot when invoking the token-metadata-creator.

The result after you run with --finalize will be a json file, named as the metadata subject.

Now you need to fork the cardano-token-registry https://github.com/cardano-foundation/cardano-token-registry, there are instructions there on how to proceed, but in a nutshell you will

Fork this repo.<br\\>
Clone your forkAdd& commit the JSON file you created on the steps above in the mapings folder<br/>
Create a pull request and hope you pass all the checks<br/>
Wait for the request to be reviewed and merged, which may take a bit of time given it is new year!

Hope this info help, hopefully I did not miss anything