Since it appears that you are not going to file anything until you return to the U.S. after getting married, the only things you'll need is whatever documents the Dominican Republic requires for you to get married in the Dominican Republic. I would definitely not return to the U.S. until after you receive a certified copy of your marriage certificate. You are definitely going to need that to file the I-130. If you and your spouse have ever been married before, you are also going to need proof that those marriages have been terminated (divorce decree or death certificate of ex-spouse).
Spot on.....I will see what docs I need to get married in DR. Eventually, if I search enough, I will find it!
Do you know once we marry in DR how long it takes to get a copy of the marriage cert? I do have a certified copy of my divorce decree but should it all be in Spanish or is the English version ok?