Hi Don,
You're on the right track. Start simple and once you understand your first few example designs, you can then read the more complicated material. Your first task is to get to know the tools.
You posted some VHDL. Did you try synthesizing it and looking at the RTL view? How about pin assignments, did you make some of those? Once you have a project that synthesizes, look at the .pin file, and if it looks ok, download it to your board.
The next project after that would be to make a blinking LED. Then make a count on the hex displays. At that point you'll feel a lot more comfortable with the synthesis tool.
Then you can take a look at a more complicated design, and simulation (using Modelsim).
Cheers,
Dave