Well, simply think of it this way. You got here on a temporary visa to get married. What do you need to show to the immigration officer who've seen it all that your marriage is real? What makes your marriage real vs a fake one? Simply put prove to them without a doubt that your marriage is bons fida.
Start from there and you be ok.
Include much as you can some examples are photos of you spending time together with family and friends and not just selfies, affidavit from as much people you know about your relationship, joint health/car insurance, bank joint accounts, joint lease/mortgage agreements, setup authorized user credit card account for someone new to the country with no credit history , joint car purchases, gift receipt to your spouse, joint tax filing documents, CERTIFIED copy of marriage certificate , etc.