Hello, and welcome! You'll find the community around here is quite great, and very supportive with tons of information. I'll take a stab at your questions.

1) As far as casting bars, yes there is Party Casting Bars which is an Addon built into the Cosmos package. You can download it and turn off everything else (except dependencies of course) if you like. I'm not sure about for totems though.

2) You will need to set up your macros such that if the tank dies, they will begin operating on your next character in line. Most of this is done by manual targeting of names IE: [target=character1,nodead][target=character2,nodead]etc and the like. I've been meaning to set this up myself, so my syntax might be incorrect, but I'm pretty sure the principal is correct.

Hope any of this helps, keep shooting the questions and I'll see if I can help you out .