Congrats with you new camera. Once you've had it for a few month, you will start saying the following sentence over and over again "I know I have an image of person X, but I can't remember where"
Sorting your images in directories has the problem, that it is far from easy finding an image with say a given person, a specific set of persons etc.
For that purpose you may wish to have a look at KimDaBa. It allows you to annotate your images and later use this annotation to find any specific image.
I have more than 5000 images now, and I'm always willing to bet that I can find any image in my collection within less than 10 seconds.
(Text written with ultra small: I'm the author of KimDaBa btw :-)