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I can help as I am at that same stage as you are, of needing to understand a full module development, made a few, yet very limited as in XOOPS templates ect and need to learn more my self and some how to record this for all other Xoopers...as you need also....
We could do with a good wiki that is easily transferable.....for all of us
As then between us we could have a guide like this started and more, as most of the documentation does exist and is being add to XOOPS Docs....
You can find a lot on here and asking plus googling it...helps lots....
Best way that I've started with, is dis-mantling other modules and seeing how these work....
Yet all that could be recorded in either a Wiki tree or been thinking about an AI system....As that would do wonders for XOOPS as a helpper system; rather then all our moderators and developers repeating them selfs on this forum, a well trained AI system could do it all for us....djuzeppe looked a really good php AI system, yet doesn't work properly...
Anyways any help can give, will do and hang around surfing all day, so feel free to stop by and ask and i check on here all day...as many Xoopers do....
Yet lot of the Doc's do exist just unsure on a more clearly pattern to follow...and will be glad when one is done at the top of Xoops.org main page asking you if you need assistance...with a Wiki search function that is clear and working....