Go ride your bike. You don't need "workouts" yet, just time on the bike.

If you're not sore after that first ride, it's ok to do a longer one. I would not add more than about 30 minutes per ride at first.

It's more useful to track your rides by time than by miles. 10 miles that's up a climb takes a lot longer than 10 miles on flat ground.

My regular rides range from 1-1.5 hours for a recovery ride to 5+ for an endurance or big climbing ride.