Giacomo Jacques BeharImmigration AttorneySan Diego, CACA licensed ·
Any and all documentary evidence proving your marriage to have been genuine and entered into in good faith, as well as any and all (relevant) evidence documenting your lives together as husband and wife, since the date of your marriage.
Joint account banking statements, utility bills that show you live at the same address, joint car ownership (if you have any), other joint major purchases together, such as the house, are things you may submit as evidence of your bona fide marriage.
I am guessing that your spouse is outside of the US and that you don't have much 'joint' financial paperwork.
Consider talking to an attorney on a 3-way Skype consultation. Some of us have been creative wit things like Skype log files, etc.
The I824 won't require extra evidence of the marriage, just the marriage record. Your spouse will require to provide lots of evidence at interview at consulate.