Which rail pass to be use for Kansai ?

Hi, I'll be have 8 day in Japan with my family , the plan is

Day 1 - Flight from Shanghai to Osaka then catch a train from Kansai airport to Kyoto
Day 2 - Kyoto visit - Fushimi Inari Taisha 伏見稲荷大社, Uji 宇治, Nishiki 錦市場
Day 3 - Kyoto visit - Mount Hiei 比叡山, Kyoto Tower at night
Day 4 - Kyoto visit - The Sagano Line 嵯峨野線 small train line and the bamboo walk
Day 5 - Train from Kyoto back to Osaka
Day 6, 7 - stay in Osaka may looking some onsen
Day 8 - from hotel train to Kansai airport and flight to Shanghai

I would like to know which rail pass suitable to be used in my trip and any rail pass need to be purchased before leaving Australia