Yes, I am definitely interested in beginning dating and at this time, my hubby will remain mono for now, but he has started to talk like he would be open to pursuing new relationships in the future. I guess we are starting with me, but I believe he will eventually begin to date other women.
Cool! In a way, it's easier for one person to go first, instead of piling on the emotions around both of you starting to date at once.
It's more "fun" to date than to experience your partner dating. You get the excitement, the attention, the NRE, the joy of learning about a new person, the romance, the sex. Your husband watching from the sidelines, may experience arousal, jealousy, compersion, insecurity. He may be on a rollercoaster of emotions. You may be as well, if your first couple of dating prospects don't work out.
Stay close and reassure each other, while still respecting the humanity of the new people coming into your life/lives. Check out the stories on this board, and the More Than Two website, for common speedbumps and how to mitigate them.
One more note, you're in TN, which is very conservative. Unless you're in a city, in which case you might not experience criticism and hatred. I know in more rural areas, Tennesseeans are very hard on people who step outside the white Christian mono hetero cisgendered box.