Welcome to our forum.
I guess my advice would be to start reading and learning about poly. We have a Golden Nuggets board
you could start with. Also there's the book "Opening Up
" by Tristan Taormino, and Franklin Veaux's poly pages
. You can post again here whenever you have a thought or question to share.
As far as your husband is concerned, I would give him some time to think (three weeks? six months?) and bring up the subject of poly again. You might also request that he do some reading on the topic, such as this site, Opening Up, etc.
I'm glad to have you onboard.