Hi @dre1080
I’ll try to answer your questions as best I can.
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Fly allows you to do what you want with the servers, including “reselling”, but they do not have any reselling capabilities and you are responsible for the bill (they won’t bill others for you). Also fly doesn’t sell domains anymore so this is not supported.
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There’s no real limit but there may be soft limits which you’d have to contact support to remove. As long as you’re paying your bill then support will probably be more than happy to increase/remove the soft limits.
Fly supports many SaaS services so it’s unlikely that you’ll run into something they won’t let you do.