From the start, set up a system for grocery shopping and clearly define which food items are meant to be shared. Refrain from eating anything that doesn't belong to you or isn't marked as a communal item.
Keeping open lines of communication with your housemates is key when it comes to dealing with guests. It's important to establish guidelines regarding the duration of their stay, when they can be around, and which areas or rooms are considered shared spaces.
Think about setting up a cleaning schedule, taking into account that different housemates may have preferences for specific tasks. Remember, you're still in charge of handling your own dishes, laundry and keeping your personal space neat and tidy.
Ensure you stay on top of rent payments and send them to the correct recipient without delay. It could be either a head housemate if that's the arrangement, or you might need to make individual payments to the real estate agent or landlord.
Make sure you've got a plan for splitting and paying the bills. Usually, one person would be in charge of handling the bills. Make sure they're paid on time, similar to your rent, to steer clear of any household disputes.
Always be prepared if someone decides to move out. Ahead of time, it's best to figure out what the process will look like and how much notice they should give you, and whether you need to inform your property manager or landlord.