Welcome to our forum.
Sounds like you have some big changes on the horizon. You are wise to learn as much as you can about poly before diving in. Take advantage of the wealth of info on this site; we have a Golden Nuggets board
for finding especially helpful threads.
Sorry to hear about those miscarriages, I can't imagine how difficult that is. I hope you and Mike get a new start on life as you prepare for your move to Alaska and your first adventures in polyamory! Let us know if we can help.