I fully understand you. Most of these tutorials are useless for some serious work. It took me few months to create a filesystem for a custom board. Probably the most helpful resource I have found so far is the #oe IRC channel on FreeNode. Also, you should read Yocto manual (http://www.yoctoproject.org/docs/current/mega-manual/mega-manual.html) -- it won't tell you how to create your own filesystem, but at least it gives a pretty good idea how things get together.
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