I'm going to give you the sample "laboratory white mice" tests before the initial performance tests you'll be consulting a specialist for. From these tests, you'll be able to tell how much serious conditioning you need.
Many exercises can improve your standing balance as a golfer. One simple balance reeducation exercise is called the single-leg balance drill.
Perform this balance reeducation exercise as follows:
Stand on a firm, flat surface in your bare or stocking feet.
If you have been prescribed customized orthotics (arch supports) for your shoes, repeat this exercise with your orthotics in place and your shoes on.
Place a club behind your spine as though you were trying to perform the club-behind-the-spine test.
With your eyes open, try to stand and balance on your right leg by lifting your left knee to approximately 90 degrees so that your left thigh is parallel to the floor. In this position, do your best to maintain your balance for 10 to 15 seconds.
Repeat the exercise with your left leg down, lifting your right knee to 90 degrees.
Do this exercise 10 to 20 times with each leg at least once each day for 2 to 3 weeks or until you can easily perform the exercise without losing your balance on one foot for 15 seconds.
To increase the difficulty of this exercise and improve your golf balance even more, try the exercise with your eyes closed! You can imagine how much more balanced you'll feel over the ball at address and during your full swing when you can master this exercise with your eyes open and then with your eyes closed.