Normally you have to take all your belongings, passport and the confirmation slip (訂位確位編號" from 'Oasis' to the check-in counter (the airlines that you will fly with) on your departure date.
Nowadays, people called this confirmation slip --- 'e-ticket', the airlines staff at the counter will help you to check-in, actually just like the normal check-in procedure.
If you still worry about it, then you can call the Oasis and ask for more informations.