Try to look at the combination runway-in-use vs. last fix filed in flightplan. You will normally find something that fits. If there is more than one possibility, one of them will often be for night-ops, ie CDA arrivals, and the other one used during the rest of the day. If still none the wiser, try to listen to what other aircraft ahead of you get. If still confused, askthe other guy what you can expect, if he has been there before. Or, you could ask atc what to expect. If they are not too busy thay can often call ahead to the next sector to ask for you. Good luck.