STUPID QUESTION. If I chose the castoring tailwheel (as the package calls it) or freewheel, as broke_n_bummin put it, how does the plane steer? If it doesn't have a steering tailwheel how is the steering controlled with just the motion of the rudder?

P.S: Would freewheeling be acceptable with a plane like the SSE? Or be best with a spring attached?

Sounds to me that the motion of take-offs, and probably landings as well, would cause the airplane to swerve all over the runway with no controlled tailwheel.