What kinds of stuff do you think in the lot would be particularly valuable?
I will tell you this: Cards between about 1978 and 1995 are generally not worth the paper they are printed on. Not true for some of the stars rookie cards, but cards were overproduced in this time period in general.
Most cards won't sell very well without a Beckett rating. And those are expensive.
The card trade went downhill with eBay as so much is available--you'll always find it cheaper.
Just thoughts and suggestions.
-wtk