Easy to follow Root Steps for Stock Android 6.0?

Hi Everyone

I have recently returned my Nexus 6 back to stock from Rooted 5.1.X roms by manually flashing the official google Marshmallow images. Now that 6.0 Roms are making their way out, I would like to get back to having the ability to flash the different roms. However, I am a little confused on how to successfully and easily accomplish the root and TWRP install process. I see that some of the new 6.0 ROMS say they are rooted, but I am confused on what that means.

Does anyone have a link or steps with links that you can provide so I can get my Nexus 6 ready to have custom roms flashed?

Thanks in advance!

After 5.1.1 more 360 stopped counting steps?

Have me 5.1.1 on My Note 4ART model, now the step count has stopped increasing (and yes I have been walking around :) ).

Any ideas as to the cause? I've opened up the app on both th watch and the phone an I can see my past counts but from the update on none. :(