Welcome to our forum.
It sounds like you-and-a-new-male-partner is a little outside your current boyfriend's comfort zone, but it doesn't sound like he is opposed to it per se. Just take things a day at a time, and if it happens, it happens. Keep the communication lines open and flowing between you and your boyfriend. Share your thoughts and feelings with each other, always.
I don't think there's any need to be in a rush about anything. Just let things happen as they happen. Read as much as you can here and learn from others' experiences. Find out what has worked and what hasn't worked for others. The Life stories and blogs board
is a good place to check out.
If you have any future thoughts, questions, or concerns that you want to share, don't hesitate to post those. It's even okay to ping a thread with a new post if it gets lost in the shuffle.
There is a lot to learn here, and many good people to interact with. I hope your Polyamory.com experience is a good one. I'm optimistic that it will be.