Doing something is better than doing nothing. Doing something that feels comfortable to you means you will be more likely to continue.
Start off slowly. You don't have to do everything out of the gate. Begin with exercises you enjoy, such as walking, stretching, or water exercises.
Choose exercises which are comfortable for you. You can always add more as you increase in strength and endurance. Eventually you can create a comprehensive program for yourself. It may take weeks, months, or years to become a regular exerciser so don't get discouraged.
What is the recommended exercise dosage for general health?
What is the recommended exercise dosage for physical fitness?