There's not really enough information to properly answer you here. 31 acres is not a lot and isn't going to contain your herd. What does the surrounding property look like? Where are the primary food sources? Bedding areas? Where is your access points to the property (i.e. primary access and then secondary entry points). Any food plots? How are the deer utilizing your property? How steep is the terrain? etc.
Once you know some specifics, it will be easier to make a plan.