For the sun roof, look for a button that looks like
this. That is the sun roof control. Assuming everything is in working order that will open and close it.
If you happen to open it and cant close it, there is a manual control in the trunk. Usually on the driver side, above the wheel well.
As for starting, as stated above, turn the key to the on position and wait for the
glow plug light (the light is the one in the bottom right with the curly line)to go out then crank her up. If the light does not work, it might be a blown bulb or it could be a faulty glow plug issue.
Any questions regarding your car would be better off posted in the diesel forum.
Good luck