Q1
every hamster need 摩牙木 / 摩牙石
but if u think it's unnessary u can leave it a side
because they can 摩牙 when they eating
but you should be care of the hamster from bitting u!!!
Q2well hamsters are always sleeping at day time
they play at night
so if you want to go out you can
if you want to go on trip you can fill up the food container
they can still alive if you have 3 days not been feeding them