As you know I had to deal with my mothers place (massive issues) and my parent;s in common law place too.
I know the heartbreak it can cause and I really sympathise but I have lots of good news for you.
1)
Freecycle - join all the local groups to you - you will be utterly amazed how delighted people are to take all (& I mean ALL) of you stuff. You 'Offer' or 'want' items. Some linked 'online cafe's' will offer bartering and other arrangements/help.
2) keep everything you think you want to 'think about' no matter even if you have to store it for a bit - even just for your emotions it will help.
(I have a lot of space in Scot but we can talk about it elsewhere)
3) auctions will often sell everything and of course ebay /gumtree are obvious direct routes but your local auctions will help all they can or should if they are any good !
4) house clearance places but they pay nothing and de-value everything.
5) many people love 'real furniture' and will buy if a fair price - advertise in your local paper.
6) perhaps put some into storage near to you, to help sort things out/ sell from, or just keep (for a while?). Some storage companies offer really good deals at the moment ... check into it.
7) perhaps change some of your items for those that have more sentimental value ...
8) for specialist things like the wonderful sounding ship - look online and find the clubs or where collectors meet and advertise it there. Local clubs took various items we had and although they didn't pay much, but we had the knowledge that they really valued the items and loved that we thought of them. Like me they could see the value in the items.
9) Some museums will take a few things but it is a bit harder if the items are 'popular' or not rare, as they get offered so much, but it can encourage you to hang onto them until they have an exhibit where they can then use it and pay you to have it on show !

10) photos - keep them - they can all be transferred onto more modern mediums. Plus you will probably find some treasures in there .. then you can offer it to the National Archive Museum/Centre as they always look for images of times past. Give them as much data as you can about the images - take your time if you need to ..

There are usually collectors / small museums somewhere in the Country !