Everyone here will eventually be in this situation.
First with two options, A) don't prepare, do nothing, leaving everything to your heirs to figure out. B ) You do something about it.
This is where things get complicated because there are many options with varying outcomes.
I think the easiest thing is the bulk sale, everything goes for one agreed upon price. I think this is also the one avenue that will net the least return on your holdings.
The problem of the next few options, Ebay, Craigslist, this board. is that they will require a large amount of work on your part or someone helping you and will be a rather long drawn out affair, photos, setting up an account (ebay), listing, following the listing, follow through on packaging and mailing. Figure in some travel here as well, to the post office, somewhere to get packing material, etc.
Clubs and hobby shops are another way, but again requiring some leg work and typically they won't want everything you have leaving you with some residual.
So you have to decide how much effort are you willing to put into your liquidation ?
Ultimately, what is it you wish to achieve ? Just getting rid of everything or turning a profit?