I didn't have a clear understanding of your question, I thought you were asking about concealed carry with a flashlight.
as far as the 30 ft zones that you could encounter while protecting your home, I live in a state that doesn't have a castle doctrine, meaning that I can only use deadly force in my home if I have retreated as far as I can, and had literally no other option. because of my state laws, im not really allowed to think that way. If you do live in a state with a castle doctrine of a stand your ground law, then yes you could be faced with a situation where you may need to shoot 30ft.
as far as the laser goes, by all means if it would make you feel more comfortable. there are some really good laser/light combos on the market. my only question is whether or not ill be able to see a small red dot on a target 30ft out.
btw you really hit the nail on the head as far as instructor training goes. A lot of people think that a ccl class and a few weekends at the range is enough, and in my (and your) opinion it really isn't enough. Instructor training is great, and dynamic handgun courses are even better. Not only are they extremely informative and emphasize a wonderful amount of safety, they're also just really fun!
You definitely have the right state of mind for this, and I wish you the best.