Do you both already have passports? Visas? Travel insurance?
How are you getting there and back? How are you getting around in-country?
How will you spend money in that country? Is it one that requires cash? How do you get that cash if so?
Can you speak the language? You may want a phrasebook.
How will your phone work or will you turn it off completely to avoid roaming charges?
Will you be doing laundry? Do you know how to buy detergent and such?
Edit: also, how will you charge things? Are outlets and voltage the same? Do you need an adapter (fine if voltage same) or converter (such as when you're form a ~100v country going to a ~200v country that would fry your electronics with just an adapter).