I didn't know about raw pu-erh until recently either! It took some internet research, buying samples, trying a few different kinds, talking to people who have treaded the path before me, etc.
But yeah, most stores that cater to the pu-erh layperson seem only to carry the cooked stuff. I only liked the cooked stuff at first, but now the raw is growing on me.
Another thing about aging... When they "cook" the pu-erh, they're essentially composting it, which is more or less equivalent to aging it very quickly. So aging a cooked pu won't have as big an effect as aging a raw pu (which still has all of its, umm, whatever is in there that gets processed by the microbes in the aging or cooking process). Still, it does have some effect -- I've tried some cooked pu-erhs from the early 90s that are *way* different ("mysterious" might be a good word!) from anything I've tried from the past 5 years. But I've also tried some cooked ones from the 90s that just aren't that great. I guess it depends on a lot of factors....
Anyway it's a fun learning process. I only recently got "serious" about tea, and my wife, friends, and coworkers think I'm crazy.
I probably misstated some things in here, so you wise ones, please correct me.
Anyway, If it's a bad tea, let it sit, get some other stuff and try it out! Good luck......