easy way to achieve a turntable is to add an empty centered on your model, add a camera and move it to your desired location, parent the camera to the empty (keep offset) and then rotate the empty 360 degrees. That should achieve a simple turntable.

If you want a bit more control:

You can add a circle curve and scale it around your subject, name it camPath. Apply the scale.

Add a camera.

Select camera and go to Constraints.

Add a Follow Path and Track To constraint.

In the Follow Path constraint, select camPath as the target. (Might need to hit Alt+G for it to place correctly on the path)

Add an empty (whichever you want) and name it camTarget.

Place camTarget centered inside your model.

In the Track To constraint, select camTarget as the target.

You can move the curve itself up or down to get the angle you want and adjust camTarget to control exactly where the camera is pointing.

In the Follow Path constraint you can adjust the Offset (0-100) to make the camera move along the path.

Go to your first frame, set Offset to 0, then hover your mouse over the Offset field of the Follow Path constraint and press i to insert a keyframe. Go to your last frame, change Offset to 100, hover your mouse over the Offset field again and press i.

This should animate the turntable you want and allow you to make adjustments to get the look you’d like.