For the calories already there when set up, Fitbit includes your BMR (basic metabolic rate) calories that you are always burning just by being alive. These are credited even when you are not wearing the tracker. The 1100 would be your BMR calorie burn since midnight.
See How does my Fitbit device calculate calories burned?
You must be looking at starting exercise from the phone app. You can start right from the Charge 3 using the Exercise App. From clock face, scroll right to 'Exercise' and tap on that; then scroll sideways to the exercise you want. There can be 6 exercise shortcuts shown there, but you can choose these 6 from among a choice of about 20.
The following help section tells more about this, and how to select which choices you want.
How do I track my workouts with my Fitbit device?
Before posting, re-read to see if it would make sense to someone else not looking at your Fitbit or phone.
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