Thank you very much for your time and your response! I had already figured out what I was doing wrong, however. I just wonder why you have to be in iTunes on the iMac before you can access the library on the iPad? Maybe Apple will reconsider this requirement in the future where, as long as the iMac is running, you can connect to the library. I still relate some things to the PC world like peer-to-peer file sharing...
Again, thank you!