Welcome to the DIS boards!
You will see that this IS THE PLACE that you can get all the info about Walt Disney World !!
So just keep reading.....and have fun.
Anyway, about CSR........
It happens to be my favorite! Been twice.
Once with DH and DD (8yo at the time). DH did not care for the fact there were a lot of business types. We went in April and there were a few large conventions there at the time. It did not bother me one bit. But DH travels and has to see "business types" all the time. He just felt he wanted to be at a resort where everyone just wore shorts and T's!

and drinking margaritas by the pool!
The second time....last April......was with DD (12 at the time) and older DD, 26 yo. We ALL LOVED it! I felt it was much more relaxing than the other moderates that have more small kids running around. There was a convention there, but we never really noticed them except when they were setting up a dinner/event outside in the large courtyard.
For our next trip this June (it will be me, DD and DH) I was torn between CBR and CSR. It was a toss up since DH will be with us this time, otherwise....it definitely would have been CSR.
We decided on CBR because we haven't been there since June 2002, and they've updated the food court, etc. and.....CBR is just a bit closer to Epcot and MGM.....we always have a car and drive to those 2 parks.
BUT.......there is still time......I may convince DH to try CSR again!!
Your 15 yo DS will love the pool too at CSR. And he will not have to deal with as many little kids running around!
Anyway, have a GREAT TIME!!