Welcome aboard Tim.
Everybody starts somewhere. Cycling is a great way to achieve good fitness. Good luck with your future cycling goals.
I commute most days to work (10 miles each way) to keep the engine in good shape. Then I'll ride evenings when there's daylight and the weather's good, and weekends I'll do big, long rides.
Sometimes I do a mountain bike ride/race, but my heart's on the road....