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It really depends on the implementation you choose. Are you using PHP? ASP.NET? Ruby on Rails? Flash media server? ColdFusion? Are you just sending a file through a pipe to another Flex/AIR application?

Though, you can find most tutorials for this kind of stuff on Google. I never really went to Adobe much for help with Flex. I just watched Lynda Essentials and BTB and then done some tutorials for certain aspects and it all culminated together.

And for the money aspect, who do you plan to charge for the service? Client or the Consumer?