there are several books about development for bb, but i don't know any focusing on the UI aspects.
maybe you could write your questions down?
in dealing with UI you have a couple of layers (i just put them up, you can make a more granular distinction for sure).
the first layer is standard components. this means editfield, bitmapfield etc, neatly packed into a verticalfieldmanager etc.
the second layer is a custom layout, modifying the position of fields manually. this provides a workaround for the limited options of standard layout managers.
see http://www.blackberry.com/knowledgecenterpublic/livelink.exe/fetch/2000/348583/800332/800505/800508/...
also in the second layer would be modifying the interaction, like providing own fieldchangelisteners, overriding event methods like keychar, navigationclick etc. or changing the focus handling with movefocus, navigationmovement.
in the third layer i would set the direct access to the screen/fields panting. overwriting paint you can do whatever you want - within the limits of the graphics class. drawfocus etc are similar methods that change the field directly.
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