I'm pretty sure that you have to go to Windhelm or wherever everyone hates elves and there will this tower type thing and Articius Something or other lives there. Pick the lock and get in. You might see an old woman and a boy fighting because the boy wants to play with him. Anyways, go upstairs and you'll find the kid and he is in a room doing the Dark Brotherhood Chant on his dead mother. Talk to him and he'll think you're an assassin. Go kill Gretel the Kind and keep following the quests.
Yes, you can.
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.
There are no others you can acess other than the 1 in cheydinhal
It is given after Dark Brotherhood quest "Breaching Security"
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.
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 never ends idiot
Yes there are some but there are some in houses so be careful!
Factions you can join: Companions College of Winterhold Dark Brotherhood Stormcloaks Imperials With the Dawnguard DLC: Volkihar Vampires Dawnguard
No, I have finished Theives Guild and Dark Brotherhood and nothing's happened to either of the factions.