Silverware is a finicky sale. At the local flea sets of forks will sell very quickly. Individual forks will go for a quarter each most days. The small spoons, knives, and such are very much up in the air.
If you have a complete set that will make it easier to sell. Do a quick search on replacement.com and ebay for the specific set/style to get as much info as you can.
I put my stuff I had found up on ebay but it didn't sell. Have not tried again yet. I split my listings out by type, so forks in one, spoons, etc. May try it as a complete set next time.
I will say polishing it up would make it sell better at the flea and think ebay IMO. However, there are so many different buyers on ebay who knows if they would really care or not. One may, but the other three may not. All up to how much time you have on your hands. Myself, I'd inventory it all, snap a picture of it on the kitchen table, and list it w/o spending a ton of time on it. Then if it don't sell can re-visit it.