Hi @Adam2658 sorry to hear about your marriage that didn't work out.
Evidence that you currently have is not sufficient to get I-751 approved.
0. You'll need to know when divorce is finalized. You will be asked to produce divorce decree for I-751. Whether it's submitted with initial filing or as a response to RFE doesn't matter much. Better to include with initial filing of course.
1. USCIS will want to know whether you ever lived together. Do you have a copy of the lease with both of your names on it? Do you have copies of utility bills with both names on it?
2. USCIS will want to know whether you co-mingled finances. You can request joint bank account statements, since your name is on it. Contact your bank now and get as many as possible. You can also register on IRS website and get transcripts with both of your names on them.
3. Did you share health insurance, car insurance with your spouse? Any evidence of that?
4. Do you have copies of your travel reservations? If you booked flights, can you show reservations or boarding passes with both names in them? Any hotel reservations with both names listed?
5. Did you buy any presents, order anything in Amazon showing your name in billing address and her as recepient? Did you have any memberships together, in both names?
6. You would have to get affidavits from people who knew you as a married couple - landlords, friends, acquaintances.
7. If you can, get a sworn affidavit from her stating the marriage was legitimate but didn't work out. Usually, it helps to have an immigration lawyer write this one up and ask her to sign.
Expect to be asked many personal questions during your interview. Names of her parents, her birthday, how you lived together, motives for marrying and divorcing, etc etc.
Good luck!