first off, you will need to
unlock your phone before you begin to flash the custom ROM which you downloaded. Make sure you read the instructions fully before flashing your phone.
Once you are flashed you can begin to install the Dusk theme. I believe Dusk will theme most of your WM device, for the extras (dusk shutdown, dusk task bar, etc) you will need to download and install those CABs. Dusk task bar requires you install SDK Certs beforehand.
You can search google for different Manila 2.1 clocks. Once dusk is installed, install your clock.