Works great! Much better than walking.

You can surely view lots in the Old Quebec City in one day. But keep in mind you won't be able to see everything.

Yes you sure can but you may get a better exchange rate at a bank than anywhere else.

I would suggest a taxi

A cab is easiest but there is fast link train as well but we used taxi it is a fixed fare

Don't let the rain (or snow) deter you. The city, with its narrow streets and cobblestones, and hilliness becomes a reflective canvas, with sparkles of light from many sources. It can be quite magical to be out and about.

Yes and u can take your car on it. Also there is an awesome French market for lunch several good restaurants and an amazing ice cream place. The town is call Levi. But less well spoken English on that side. No tourists. More locals

Transportatiob by public bus in Quebec City is very easy to use. I suggest you buy one of the daily or multi-day card passes so you have the freedom of taking any bus without worrying about using coins to pay for the bus fare.Google maps helps with recommendation for the best bus routes between points you want to visit.