There are many different types of transgender non binary identities; nb is an umbrella term used instead of having to explain your own particular type. Like a binary trans person, some only want to socially transition, some want to take HRT but not have any surgeries, some want some surgeries but not HRT and some want HRT and surgeries. It all depends on what would make you comfortable within your own body.
You might want to check out the non binary network on tumblr and YouTube for more information or 'beyond the binary' an online magazine about all things nb.
For me I identify as a demi male (someone who feels mostly male but also another gender, for me I feel slightly like I don't have a gender at all). And I'm also demisexual; so it's nice to meet another ace person on the forum 🙂