Hi Scott,
Substack newsletters populate a webpage automatically as you send them, so they become, in effect, a blog too.
This is one of the great things about Substack.
Some people have a separate website to their Substack sites, but that only makes sense for people with other online activities, like selling services or products.
So if I was you I wouldn't waste time doing a separate 'blog' and a Substack newsletter, I would just do the Substack.
If you check out my Substack homepage it looks a bit like a blog. Each post was originally sent as an email to my subscribers.
https://pubstacksuccess.substack.com/
click "Let me read it first" to get to the homepage without subscribing)