Seeking advice on subdividing a property

[John Shepherd]

We are based in Georgia and primarily are doing flip houses right now. I have found a property we are interested in purchasing.  This property has a house on it now that needs renovation.  I am interested in renovating the existing house and subdividing the land into smaller parcels for new construction. The renovated house and 5-10 acres should pay back the entire property purchase leaving me with 35-40 acres of buildable land. I am seeking advice on what type of contingencies should be in place when I make the offer.  I know I will have to go through the rezoning process.  My questions are :

-Survey done before or after closing to show new lot lines or just a simple proposal of potential new lot lines to show county

-Contingencies based on county approval of subdivided lots

-Any additional info someone who has done this might have to help