Fare speed train from Tokyo to Sapporo

Hi, I'm planning to visit Japan and have some querries in relation to the Rail pass :
1. How much it cost if I want to buy 7day tickets for 2 adults and 2 children aged below 11?
2. will this rail pass is unlimited?
3. How much it cost for the separate fare from Tokyo to Sapporot ( if we don't buy the 7days package option)?

Thank for your responses.