Sitting on someone else's seat is worse than chewing their gum. This should be left to the stronger or more experienced cyclist of the two. It's a far from an impossible task, but certainly more challenging than your old Schwinn Stingray. There are many kinks to work out and gadgets to tinker with. A new bicycle will also need some minor adjustments after the first ride.
Many parts settle into place.
If you feel you're up to a thirty mile ride, try twenty or twenty-five the first time. When ever possible, start your ride into the wind. This enables an easier return when the legs feel empty. Ride with the flow of traffic and obey all traffic signals. If you're hungry or thirsty, it's too late.