Eva

Hi i have a plan to sapporo from tokyo. my train using shinkansen from tokyo to shin hokadate will arrive at 10.59 am at arrival track no 12. Then continue using train ltd express super hukoto 9 at 11.09 am. But the problem is there is no information at hyperdia what gate depature number for departure from shin hokodate to sapporo? Is that enough time for is to change transfer train with only have a time 10minutes? And using ltd express train, do we need to make a reservation seet also? Thanks eva