Ok.. i take my question back..
Not that i figured out yet how to solve my problem; but there are so many posts here referring the same theme, that i feel ashamed to have asked the same question again.
What i will try today is to work my model, go to the TCE (and since i read it is the best to do when importing into SL
), turn on spherical and then work my way through to snap each vertice "out of bound" to its place (i.e. top, bottom, right and so on). And thus i hope this is what everywhere is written: filling the "black holes" in the UV Map.
I gather my misunderstanding is (as a newbie in modelling) the difference between UV map and texture.
I understand it like this currently: the uv map gives my object in SL the shape, the texture is the skin.
Thus i dont really need a texture in the beginning just to check whether my sculpted object in SL looks right.
And texturing is the next step on my way to make it really nice.
When i am completly wrong on this, please, please, please tell me. I´ve allready spend many frustrating hours failing :cry: