Prerequisites for Selling Software Online?

Hello!

Recently I've been considering selling different fairly complex PHP
scripts I've written.  Seeing as how the most business I've conducted
online in the past has been simple freelance assignments for various
clients, I'm not quite sure as to how the best way of going about this
is.  So I was wondering about things like licensing, collecting
payments, best way of distributing the goods, other legalities, and
anything else I may have overlooked.

Thank you for any insights or advice you can provide.  :)

--
 -Ryan

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