Homebrew PCBs

I am trying to build a PCB layout. I have very limited experience 
even making schematics. I have mostly worked by breadboarding 
circuits, adjusting until it works, then using point-to-point 
wiring. Or, I have worked with prebuilt PCB's.

So, this is a learning experience for me. This time, I breadboarded 
a circuit, and then I created a schematic. The next step is to see 
how I would make a PCB from this.

I used ExpressSCH (from ExpressPCB.com) to create the schematic. I 
am fairly pleased with the results.

Questions:

- The software recommends linking a schematic to the PCB. Why is 
this important?
- Should "good" PCB software take the schematic output and begin the 
PCB layout for you? It seems that the software should at least place 
all the components onto the PCB in a rough manner for you. Does 
anyone know if this software does this?
- Does Eagle SW make it easier to do any of these tasks?
- Does anyone know of a library for Eagle that includes the 
PIC16F7*7 devices?

Thanks in advance,

Bob H.