Hi Sunny!!
What city are you near?
Now that you've taken your first course, it's time to consider more extensive training. The first thing to remember here is that you are now likely to develop bad shooting habits. It is very important that you have someone review your shooting in person and correct mistakes. For now, you should focus upon trigger control and grouping well at 3, 5, 7, 10, 15 and 25 yards. Good groups mean you are doing something consistently (correctly or not). Get help early if you're all over the place or feeling frustrated.
Self-defense is a complex topic. Some of the skills you need to learn are:
Running your gun and malfunction handling
Movement
Retention
Basic combatives
Managing the police
Tactics
Low Light techniques
"Running your gun" includes many subskills and does not mean "open the cylinder, load, close cylinder". It is far more than that. It includes rapid fire, the sight continuum, alternative methods of loading, and so forth.
There are many self-defense oriented schools and trainers. Unfortunately, the VAST majority of trainers do not know how to properly run a revolver. A few people still train with them: Thunder Ranch, Gunsite, Grant Cunningham, and Michael J. de Bethencourt. Attending a course by a semi-automatic oriented trainer is better than nothing! Much of it will be the same (tactics, managing the police, etc). Gunsite and Thunder Ranch are quite expensive; I generally never pay more than $400 for a two or three day course. I know these may not seem worth it, but they are because you'll really get to know your gun and learn quite a few new skills. Keep in mind that you are increasing the odds of winning; you can do everything right and still die. Some of the most important lessons are when to shoot, how to handle the police, court, and how to properly practice after the course.
Check out
SnubTraining.com. There are videos on reloading and de Bethencourt offers training.
Look around your area for ICORE, IDPA, and IPSC competitions. These sports include revolvers...and revolver shooters! You'll meet a bunch of good people who can put you in touch with trainers or groups to train with. If all else fails, just jump into competition (even if your gun isn't very competitive) to get the experience. It's lots of fun and you'll get to shoot a wide variety of fun targets.