What are all the licenses and I.D's that I need to start an online business?

I am in cincinnati, OH. so I want to make sure I get this taken care of properly? should I go down to city hall or a tax place to obtain these documents? I am skeptical of doing it online. If there is a reputable online place I can do this then I am willing to try that.
Update: Also I dont have any employees so just a bit of FYI. I am just selling accessories and shoes.
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