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During the install I declined the default .htaccess since I installed it on IIS 8.
Is there additional ReWriting I should add with the IIS ReWrite module to make sure things work well?
We lack official docs for IIS and I don't believe anyone at the company has much (if any) IIS experience. I can point you at our nginx docs in the hope they can be of indirect use: https://docs.vanillaforums.com/developer/backend/server-nginx/
If you discover additional helpful setup steps for IIS, we'd certainly accept a PR to add a new page of docs: https://github.com/vanilla/docs/tree/master/content/developer/backend
I think the manager has an importer of .htaccess rules, which would be a start.
There isn't much support or testing of IIS.
grep is your friend.