Most dreams need research and planning. Work on that together. Each of you take the tasks that you are good at or more passionate about. One of you knows how to do research on the computer? One is better at talking to others? Come back together and share.
Try to be as objective as possible when researching. You want to live in one particular community and your spouse wants another. If you are doing the research on the two communities, don’t skew the results so that you will get the outcome you are hoping for. Be fair.
The process of working on the dream can enhance your relationship. It can also stress it. It’s up to you.