Step One: Place the MOBO in the case to determine where the stand offs line up in the case to the MOBO.
Step Two: Place the stand offs in the case, where they lined up with the MOBO.
Step Three: Install CPU, HSF & RAM onto MOBO
Step Four: Install the MOBO on top of the stand offs and use the screws that came with the MOBO.
Step Five: Hook up the connectors from the case, DVD, HDD per the MOBO manual.
Step Six: Install the GPU and connect PSU connector(s)
Step Seven: Install the PSU connectors to the MOBO.
You get the picture from here...