Hi Heidi,
Deirdre gives great advice. I would also think about what kind of printer you wanted to be: commercial/production (printing others’ designs), wholesale/retail (printing your own designs for resale on Etsy or elsewhere), or a combination of the two (designing and printing your own invitation line, for example). Do you want to be a shopkeeper in addition to a printer? Figuring out these things can help you decide what to focus on as you gain printing experience, and might help keep you from spreading yourself too thin.