The only way to quarantine a fish is to put it in a separate tank, I'm afraid. You may add the fish to the tank and have no problems at all but there is no guarantee. When you say the fish are arriving, do you mean they are being delivered to you or your lfs?
they are being delivered to me and my LFS is about 60 miles from me so i cant leave them there for a week. what is the worst that could happen if i put them in??could all my fish be wiped out?? there must be some way of doing it without another tank or filter surely??