7 day trip in November

Hi

I will be travelling to Japan in November.

My planned itinerary is:

11 November - Tokyo to Osaka
12 November - Osaka to Kyoto (day return)
13 November - Osaka to Kobe (day return)
14 November - Osaka to Tokyo

Is it worth me getting the JR Pass? Can I use it on all the routes? Is it also possible to use on the city metros?

If it is worth buying, please advise on the benefits of the green car

Also, how do I get the tickets in the station? Do I just arrive at the station in time for my train?

Thanks