Your sketch is not fully defined, that is why everything moves. Define your construction lines and change a dimension to move them.
A good bit of your sketch does not make logical sense to me.
I suspect Sketch Blocks might aide in this study and nearly all geometry should be fully defined except perhaps for a bit that you might want adaptive to the location of the Sketch Blocks.
In any case,
can you attach a *.sldprt file rather than a mere image?