Ideally you would want 3 raging blows in the CS (outside of executes ofc). So you could do: CS, RB, BT, RB, RB. You don't want to delay BT by too much, you could also do: CS, BT, RB, RB, (br) RB. You should not do CS, RB, RB, BT, RB, doing so will delay BT, but it is not that big a deal if you can get the three RBs.
Also you should not delay CS unless it is for executes (you might only get one CS in the execute phase, delaying might give two). I hope this answers your question.
Regarding the opener there are a bunch of threads about it.
I prefer:
prepot/shout
charge/BT
heroic throw
banner/dragon roar/BB/non-crit trinkets
reck/BT/crit trinkets
CS/HS
RB/HS
BT/HS
RB/HS
RB/HS
I use heroic throw only as a filler so I can get a BT with reck up before the first CS, it also gives trinkets time to proc. I also save bersker rage just in case I get unlucky and BT doesn't crit enough for the 3 RBs.