Lets say you right click the desktop and select create launcher. Then you get a dialog and in the upper left corner is a button with the text "No icon"
Push it and you see a bunch of icons....
The pdf error seems a bit odd, but it's probably some error in the file association
Right click on a pdf, select "Properties", select "Open with" and finally select "Evince" If Evince is not in the list there's a button "Add" at the bottom which gives you a list of all programs.
If that did not help, post back and we'll try something else
can't view icons when trying to assing one to a launcher
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