Recent contact with bio-sib. Now what?!

I've been hitting the boards here pretty hard today, but today is the day I finally got in direct contact with a member of my bio-family. Contact was made through Facebook, to my biological brother. Some quick backstory: He was born in 1975. I can't know yet whether or not he was raised by our bio-mom, but at least I know he stayed within the family. I came along in '77 and was adopted through Catholic Charities. I started a search about 4 years ago and the case worker did talk to my bio-mom a couple of times, however, it sort of just ended there. The rest of the digging (and gaining of identifying info) I did on my own. Over the next few years I also tried contacting an Uncle and and Aunt. Nothing. I actually have no idea if they even got the messages. Fast forward to this afternoon.. I was skulking around the FB pages of bio-fam (as I tend to do when my curiosity gets the best of me) and ended up accidentally putting in a friend's request to my bio-brother. Figuring it was too late, I went all in and just sent him a message. He replied!! It seems he may have no clue I existed and is going to try and verify the adoption through the agency. I'll be calling CC tomorrow as well to see what I can do to be sure he gets the verification. Anyways, my point in typing this out here is.. I have no idea how to go about things after the point of verification. All the previous questions in my head were geared toward my birthmother, or members of her generation (aunt, uncle.) I find myself more nervous about talking to my bio-brother and I'm not sure why. This might be complicated by how it seems like he had no idea about me even though he was likely around his mom while she was pregnant with me. I've known about him since I was 18, when I first went to get some info from CC. Back then I didn't start a search though. I'm about to turn 36 and my bio-bro is 38. That is a long time to not know about someone! Not sure what I'm looking for in posting this here but I'm kind of looking for any advice, input, warnings, cautions and/or encouragement. It'll be a bit for that verification I'm sure and in the meantime I want to try and prepare myself for what may come my way. :)