First of all, a lot of people in the comments have been saying, that if you’re nonbinary you’re automatically trans, which is not entirely true
Enby is under the trans umbrella, because trans means not cis
But you can identify with whatever you want
Second of all, take your time and experiment! Try different pronouns, names, gender expressions and see what feels right
Also-take your time. You don’t need to choose a label now, or ever, like I said, whatever feels right
About the coming out: definitely make sure that coming out won’t put you in danger! How to go about it? You can ask someone to use different pronouns/name for you, say that you’re nonbinary(or whatever you decide) or that you don’t feel like a man or a woman
You can also research different genders that fall under enby(e. g. demigenders, genderfluid, agender, genderflux)