I haven't been able to draw anything useful on LibreOffice Draw. Where are the different shapes to make diagrams? All I can find are basic shapes that I would find on Microsoft Word (squares, circles, stars, arrows, etc). Will I be able to make more elaborate diagrams like a data flow diagram or a basic UML diagram?
LibreOffice is a general-purpose drawing application and rather unsuited for diagramming and scientific drawing. It only -- as you have already seen -- provides basic shapes.
For diagramming, GNU Dia is an excellent tool, but there are many other great programmes around.
EDIT: I also want to mention yEd: it scales very well to big graphs and can be run via Java WebStart. It has some really cool features.
Just find it in the bottom pane
If you didn't find it, just go to
View > Toolbars > Drawing
That's all..You will get it.
As usual, like Microsoft Office you will get in the respective menus. [If you still remember the old office menus instead of the new Ribbon interface]