Hi Emy, I'd have to recommend staying away from any ruby scripting until you are familiar with SU. Not many people really ever get into it.
As for smooth transitions, that is a little bit tricky sometimes. The main thing to do is try to keep the distance between all scenes approximately the same. And dont have any sudden camera u-turns. You can right click on a scene and choose "play animation" and it will try to play your animation for you. This can help get a beter feel for the animation before you take the time to export it. Also, try exporting it at a low resolution with a low frame rate (15 for example). This helps make a quick render of your movie, that you can check to see if your camera passes through walls, or is too jerky ever.
Those are the main things you can really do to help make a slightly smoother movie. Try that and see if you make any progress.
Chris