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Honestly your question is far to broad. IO architectures are as unique or more so than amplifier designs. There are thousands of ways to design a circuit that meets your needs, and there are thousands of different IO specifications that people have need for. The reason you are probably overwhelmed with an IO library is that most libraries includes huge amounts of IO flavors, and even selectable options for each flavor to meet a specific need. There is no one architecture that can be explained to you that will help you know how to build an IO library.
If you have an IO library, the foundry or your IP provider should have included a users guide on how to select which IO for what type of application or specifications. I would start there.
Note I am not even talking about specialized IO such as a USB interface, Display Port, HDMI, SerDes, Hypertransport, DDR, DDR2, DD3, SMBus, I2C, etc etc etc...need I go on.
As for ESD, thats even more complex and nuanced than the IO design, and ESD is really a chip level architectural solution, not just an IO architectural issue or an ESD device. I wish I had an easy asnwer for you, but there isnt one. If you have a specific question on a schematic, feel free to post it and maybe we can help you out. Again, like ljxpjpjljx said, your question is too broad.
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