so nonbianary is an umbrella term and you can be as specific or as unspecific with your identity as you want
some people on the nonbinary spectrum feel genderless, while some identify with all the genders. the genitals/the genitals they want can depend entirely on the person. for example, my goal is to have no boobs, and both a p**is and va**na. some people may want a p**is and flat chest, some people may want boobs and a va**na, some people are fine with the parts they were born with, and some people don’t care at all.
so to be nonbianary all it really means is you identify as something other than male or female, and it’s up to the person on how much detail they wanna go into