If you don't really want to do it all yourself, I found two master sets.
The first, located Here
is a master set that includes everything in one massive tileset.
But it would take quite a lot of time to configure properly.
If you'd prefer to have it broken down a bit, there's a set of two.
One contains almost literally everything needed for an exterior, the other, nearly everything for an interior.
You can get both of those tilesets Here
I'm sorry, but I do not know who to credit for either of these sets.
There's apparently been some confusion about who made them, and I've been trying to find out who made the second set because I'm using them in my own project.
Now, you'll still have to configure whats walkable and whatnot, but once you have that done, you can simply copy and paste another set to change which autotiles are used for that specific one.
That way you can use as many autotiles as you wish, of course, you're still limited to the standard amount of autotiles per map.
Hope this helps!