How should I approach the brother I've never met?

[turq]

this happened to me before.
i have a half brother who is about 16.. the same as my full-blood biological brother. my "father" cheated on my mom when she was carrying my real brother. i want to talk to him but i do not know where to find him, nor do i know his name. he doesn't even know that i exist. but if i were to ever talk to him, i would say.
"hello, my name is .. and i think you're my half-brother. i'm not sure how your life is, and i know you might not want anything to do with me, but it would mean a lot to to me if we could get to know each other. i have a lot of questions and i know this is random but i've known about you for awhile and i'm pretty sure that have the answers to your questions. it would be a big let down if you do not reply, but i understand. because this is kind of a shocker.
thank you, and i'm sorry you had to find out about me this way."
something like that