Welcome to our forum.
I guess my main advice is take it slow and keep communicating a lot. Have the two men met one another? That might be something to consider.
I hope you are benefitted from your time on this site. Have a look at some of our threads and see if you have any questions. The Golden Nuggets board
might be a good place to start.
Will your husband be checking Polyamory.com out? Who knows, it might help him organize his thoughts.
Glad you could join us.