Autodialer schedule broadcast

if I have a new call list that I have scheduled to start calling (lets say) the next day at 10.00 a.m., do I have to keep my PC on all the time overnight?

Yes and no. If you turn on the PC the next day before 10:00am, you do not need to keep your PC on overnight.

If it is an unfinished call list that is to be continued the next day, will it start from where it left off or will it start from the beginning again?

It will start from where it left off.