Can you help me?

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I am thinking of starting an online business. I would like to sell calanders (laminated) with personalised pics on them. I also would sell T shirts with personalised pics. Another service would be invitations or greetin cards (personalised ones of course) Customers would have 2 options. Either I make them & mail them all to the customer & then they mail them or for more $ they could email me a list of name & address of people they want to invite then I would mail them straight to the individals on the list. What do you think? How well would that work? Would you consider purchasin something like that? Thanks for any input!