1997 E420 Headlight and coolant

[alabbasi]

Two questions:

Getting a coolant low indicator on my dash.
1. I went to fill the collent but could not find a fill line. Does it stop at the black cap line on the resivour?
2. The right hand main light went out on me. Are these easy to replace. I think it may be a xenon light.

As always , advice is appreciated.