The right time to discuss your story is when you feel comfortable revealing details of your story. There is no definitive right time. Each of us is different. Our recoveries happen at different speeds and we reveal in different ways. Some people let it out in small amounts, and other tell it all at once and just get it out.
My T gave me good advice and told me to only let out what I could handle being disappointed with if the big reveal didn't go well. You can always reveal more, but you can't take it back.
If you feel more comfortable telling your story to just one or two people at first, you can send PMs to a few members.
Use your past as your guide and think of instances when you've had to reveal something about yourself and then decide if you want to duplicate that situation or modify it in some way. Also, look at how other MS members have told their stories. If there is an example that stands out for you that you think is the perfect way to tell, then imitate that.
The same advice holds true for the WoR weekend. They may give you more direction about what to say, when to say it and how to say it.
Again, this is your story. It is unique to you, although there will be similarities to other's stories. Tell it in your own way in manner that fits your style and that will support your personality. Good luck, Bill. You'll have a lot of support here.