Here - try this link. It's a timeline that helped me with my last foster-litter. If you put your mouse over the red bars, there should be a line telling you what each time period will bring (it works on my pc, but not on my Mac, just fyi).
As for what it feels like, it's very cool. You will be able to feel the babies moving around in there. Just put your hand on her belly and wait patiently. Trust me - you'll know it when you feel it!
Yes - definitely! When Cassie was getting close, I found myself absolultely enthralled with that feeling. Every time she laid down, I would just lie there with my hand on her belly and feel the pups do cartwheels. You know - you can't just walk up to any random pregnant woman and ask to feel her baby moving, but dogs don't mind.
I can't help you there. If you put your hands on both sides of her belly, you will probably be able to tell if there's more than one, but not how many exactly. I was way off on my beagle - I was expecting two, three tops. She had six. She's such a tiny girl - I never woulda thunk it.