Im not a professional engine builder but here is my
1. Depends how streetable you want it, good aftermarket cams will make better power.
2. Cams are important, again stock cams are more for dd but make less hp.
3. Cams are where you make power, they dictate the ability to let more air&fuel through the motor. Higher compression pistons are usless with out bigger cams.
4. Here is a guide Mr.KIDD post for n/a honda folks but skunk2 pro series seemed to be favored brand.
KEEP IT SIMPLE, Vteckidds Guide to NA
5. Bigger cams can make more hp at a higher rpm than stock cams
6. Both but more torque
7. For the simple reason that there is more displacement 1.6vs1.8
8. No, just needs to be informed
Check out that link to Mr.KIDDs thread, hope this helped.