Hi, and welcome, Kay!
I am glad you found us! You should definitely have your fiance join! It makes sense, because both of you will be working on these applications over the next five years, so it's good if you both understand the process and can easily ask questions as they come up. (Definitely try to share the same thread for asking your visa questions in, though! It helps to keep the details of your situation all in one thread for easy reference.) Plus, it's nice for both partners to have a place to discuss the ups and downs of an immigrant in the relationship... no matter how much we look forward to the move, adjusting isn't always easy after the novelty wears off.
Enjoy your wedding next month!