Ranger Shaman duo

[SenseiPikachu]

Friend and I are planning on doing a ranger shaman duo, we are both completely new so zero twinkage. Will the ranger have difficulty tanking while leveling up? Would rather not have to kite the entire time.

Also, I've been reading on the forums about monks doing more dps than rangers. With comparable gear, how much more dps are we talking? Like double the dps or like 10% more...?

Thanks!