To add the floor map go to Admin Panel -> Floor plan and click on Add new.
Name the floor plan.
Double click on the floor plan you created and add the tables as per your preferences. The best option is to simply replicate the look of your restaurant.
You can have many areas on one floor plan, for example 1st floor -> Inside and Terrace Area.
Drag and drop the tables and adjust the settings.
You can adjust:
Select the Area the table belongs to
Enable online reservations for a specific table
Set min and max party size that can be seated at the table
Set the deposit amount if the deposit is required and set per table (Another option is to go to Admin Panel -> Reservations -> Deposits and Fees and set deposit per group size)
You've successfully created a floor plan.