You can just jump in with Eagle - and design something like a guitar amplifier or a flashing Christmas tree or any of the other popular beginner electronics projects - using only the supplied libraries. However, no PCB tool will provide libraries for every part you could ever want.
The Eagle tutorials are good. They take you through creating library parts. I'm not underestimating the learning curve - I was a beginner myself, once - I'm just remembering that it really wasn't that big of a curve.
Open a new library. Create a symbol called "SIMPLEAMP". Place two pins, one "IN" and one "OUT". Draw a triangle between them. Add >NAME and >VALUE texts. Now create a second symbol called "PWRGND" with just two pins, VCC and GND. Now copy the SOIC-8 package into that library. Create a device. Add the SIMPLEAMP symbol three times, nicely laid out. Add the PWRGND symbol once. add the SOIC-8 package. Click "CONNECT" and define the pin-out. Job done. The full tutorial covers other details like pin types and add rules (whether to place all three gates at once or one at a time).
When I said I could have done it in the time it took me to reply... you could have learned to do it in the time we've been discussing it.
