Good plan, Derek.

Once you have a few Medium followers you should be able to convert some of them into Substack subscribers.

It's also perfectly legal and acceptable to post the same content to both places, or send your Substack subscribers a friend link to read your content on Medium.

Here's an example of a Substack-Medium cross-post: https://pubstacksuccess.substack.com/p/how-often-should-you-post-on-substack