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Generally: Opening your PC to any outside (WAN) access is strongly discouraged. Not everyone out there has YOUR best interests at heart.
If you insist on serving your own books, consider using the e-commerce services that the (IMHO) better ISP's offer. It may not be free, but a well run service will manage the modern security needs, offer payment processing.
If you do it yourself: you need a DMZ with a PC(server) to solidly separate your work (the one you use to WRITE) network from the customer.
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