How long has it been fermenting? If you have not seen any activity at all through the airlock, check your seals to make sure the airlock is fitted and that your cover is tight (or stopper is snug).
What you should be smelling is a yeasty odor from the airlock. Other odors mixing in with it would depend upon the style you are brewing. If you want a comparison, sprinkle a little bread yeast in warm water (about 90?F to 105?F) and cover with plastic wrap. When you see it start foaming, peel back the corner of the plastic wrap and sniff. That is a yeasty smell not too dissimilar to what you should get from your airlock.
Your fermentation temperature is of the pail/carboy or the air around it? If it is the air temperature, you can figure that the wort/beer temperature is a few degrees above that during active fermentation.