Information about night trains to Sapporo with JR Pass

Kon'nichiwa

I plan to travel to Sapporo on the 3rd of November, I have bought the JR Pass but I am finding it hard to get the information on how to take the JR train to Sappora. Is there a possibility to take a night train with the JR Pass to Sapporo ?

My final Itinerary is

Tokyo Arrival

Sappora (3days)
Otaru
Biei
Furanoa

Kanazawa (2days)

Takayama (2days)

Tokyo (5days)
Kawagoe
Kamakura
Kawaguchiko

Osaka - Nagasaki - Osaka (12 days)
Himeji
Kinosaki
Amanohashidate
Kyoto
Nara
Ise jingu
Iga Ueno
Kumano
Mount Koya
Osaka

Fly out from Narita.

Is this Itinerary do able with the JR PASS ? Is there any other suggestions for the same

I will be in Japan for a total of 29 days and have bought a 21 day JR pass. I would like to cover most of the places mentioned in the itinerary within the date of expiry. I am thinking of buying the Kansai thru pass for the last leg of my trip, Can I buy the Kansai thru pass in japan and is it possible to buy 2 of them for 6 days ?

Finally what app should I download for the JR Trainlin, Buses and metro ?

Many Thanks
M