Sad to hear you're selling your Lego but selling them in the Lego community you'll better price then just yard sale etc. I'd go will BrickLink or Ebay. And I'd try to sell whole sets verse bulk. And I don't deal with loose bricks or PaB much so some one else might have a different/better answer. Maybe post a list of that sets you have if that's permitted on this forum. :thumbsup:
I've been looking for some classic space sets.
So if you go with Ebay, please post links.
But I personally can't trust a buy/sell/trade from someone that has just joined a forum and only posted one or two times.