Yes there are some but there are some in houses so be careful!
Yes, you can.
If you mean for the Dark Brotherhood or some other similar mission, all you have to do is kill them. As long as they're no longer living, the game will class that as an assassination.
Yes, the Dark Brotherhood is in Skyrim. You can get information on who to contact about joining them from the first town you arrive at.
It is given after Dark Brotherhood quest "Breaching Security"
There are no others you can acess other than the 1 in cheydinhal
You have to go through the Dark Brotherhood questline. Innocence, my brother.
You need to kill the old woman at the orphanage in Riften.
No, that's not necessary.
No. Dragonborn needs Skyrim to run
it never ends idiot
There does not seem to be any mention of a person called Binyamin as a part of the Dark Brotherhood in Skyrim. There are mentions of people named Benjamin who write walk through websites for this game.
It is part of the main quest. Delphine will give you this mission.