OP - if you are thinking about a Kraken, please research it...
FWIW - The Kraken has HP and LP ports to allow for the implementation of modern accessories (SPG, LPI, Octo).... in older configurations/regulators, not so much is any of that common.
Regarding tanks, all modern yoke valved tanks will work with the Kraken.... (and DIN if you purchase it that way)
A BC (jacket) will not be optimal with a double hose. Either a horse collar, or a wing (or "naked") The VDH Plate will allow you to utilize a back mounted wing (sandwiched between the plate and the tank), and you attach the tank to the plate the same way your BC and tank went together (tank bands). A horse collar can also be used with this instead of a wing, but they are relatively "scarce". There are also other vintage options that can be used, but your in a grey area of vintage and modern. You need to figure the options. As Ron said, learning is half the "fun".
You are a very new diver (and that is no insult or put down), and I suggest you get a whole bunch more experience in diving, find a mentor for vintage diving, but also research, read, and read again about double hose diving.