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Flex is best and you will have a good overall picture of how it works if you read this FB3 help topic in the Flex 3 Developers Guide, and all its sub-topics (should take about a week if you have a good amount of time to spend on it).
Flex Programming Elements
Make sure you read it all, compile all the sample programs, maybe change them a little as you become more familiar with Flex.
I am following your advice and started by simply copying the various code examples from Flex Programming Elements into FB3. Then I run the examples in Firefox, to decide in what small ways I would try making changes to the code. I ran into a problem with the weather example on page 14. When I try to run it I get a debug message that says "The prefix "local" for element "local:VideoCoverFlow" is not bound. Resource:VideoSheets.mxml. Path:Videosheets.src. Location:Line 6.
Two questions: Is there a place to find descriptions and fixes for code error messages?
And, shouldn't the code in the Flex Programming Elements examples work with Firefox? The weather box shows up, and I can input zip code. But pushing "Get" does nothing. There is a small window with a number of Flash Player 9 errors.
LiveDocs online may have some corrections, but in some cases you have to figure it out, or post here...
When you get the error that says a prefix, like local, is not bound, it means that you are missing a namespace definition for the prefix. I don't know the example you are talking about, but it seems like you need to have: xmlns:local="*" in the <mx:Application> root tag. This means that any Flex components you have in the same directory as your main application file can be used with the prefix local. If you had a sub-directory called "components" for example and wanted to use MXML files in that directory, then you would create a prefix namespace for those components like this: xmlns:comps="components.*"
I've got a number of examples on my blog you are welcome to use: http://weblogs.macromedia.com/pent
Good luck with your project.
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