Hokkaido check

I would go to Hokkaido in early May , I will take return flight between Narita Tokyo and Chitose Sapporo in day 1 (08.05.2013) and last day ( 17.05.2013) , my plan is :
Day 1 : Tokyo (flighgt) --> Sapporo (rail) --> Hakodate
Day 2,3 Hakodate
Day 4 From Hakodate (rail) --> Asahikawa
Day 5,6 Asahikawa
Day 7 From Asahikawa (rail) --> Sapporo
Day 8,9 Sapporo
Day 10 Sapporo --> Tokyo --> Sydney ( all flight)
I would like to know are any rail pass to use in this trip and the plan is ok?
Thank you in advance for your advices