This is called embryonic diapause. The mother kangaroo spends most of her adult life pregnant, but in drought times, she has the ability to indefinitely "freeze" the development of the young embryo until food sources are replenished. It enables survival of the species.
Yes. All female kangaroos have a pouch.
Yes. Although they are tiny, bean-sized embryos when first born, kangaroo joeys have all the features they will need later in life, including their tail, and a pouch for the female.
Embryos can be male or female.
Placentals
In the development of humans, the default is female. That is the reason that all humans have nipples.
Yes. Young female kangaroos do have pouches. Males never develop a pouch.
Baby kangaroo
Yes, all of them have tails
Kangaroos are herbivores. They do not hunt.
Yes they do.
Of course they do! They are live born mammals!
Given that female kangaroos of reproductive age are in an almost perpetual state of pregnancy, the answer is "yes".