Rzhev is pronounced [Rjief] and it's written in Russian Ржев. To be able to pronounce the sound ж you can check the alphabet section on Masterrussian:
Khabarovsk is pronounced [Khabárafsk] and it's written in Russian Хабаровск. To be able to pronounce the sound х, you can also check the same section.
There's no correct stress on place names, their pronounciation has to be learned to heart.