Artist setting up shop needs help with layout

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I sell art through Fine Art America and plan on using their app for most of my products. I also sell other print on demand and similar art items through other providers. I'm uncertain how to get started. Do I install the F?AA app first and build around it?  II have not done anything yet and don't want to create a mess I have to fix later. 'm sure some of you have done something similar. What would you suggest as the best way for me to get started to layout and set up my art business online? Thank you!! Joseph