Does anybody have any experience writing commercial plugins?

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I was thinking about writing a plugin and selling it, but I don't have any experience with the commercial aspects of plugin development. If anybody has any recommended reading material (online or in paper form) so I can do it myself or third-party solutions that would do it for me, that would be great. Specifically:

1. Plugin software
   
   • Activating a plugin via LW serial number (I know I could rig something up with the sysid global and PGP or something, but there's no sense in reinventing the wheel, and I don't know enough to make it harder to crack)
   • 30 day trials - how to implement something like that.
2. Web, money, etc.
   
   • How to set up web order forms, process CC #'s or paypal or whatever.
   • How to automate license key generation or whatever the activation code in the plugin needs to run.

Thanks for any help.