Question: Now that we have this network, I'm sure there'll be newbies coming in asking questions like,

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> How do I get started with Mozilla/KDE/etc?
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or

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> How do I start contributing to project xyz?
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I guess these questions would be very organisation specific, and would spam the network. Would these questions be relevant?

Answer: 
Most of these sorts of questions should (and, I think, will) be closed as **too broad**. There are a million different ways to "get started" with something and Stack Exchange is not the platform for that type of discussion.
These "where do I start" sort of questions will attract opinions and most likely spam (ex. You should start with this). They will be closed for a multitude of reasons. If people want to start and get support for a project, then they should go to the project's existing contributors, or owners.

If we get a bunch of "newbies" asking these sorts of questions, the site could adapt to create a specific reason for closure to send a message to provide well thought out questions if they still apply, or to go directly to the project itself.