A Song of Ice and Fire (Game of Thrones)
I don't monitor this thread as I'm not expecting any communication here what so ever.
As for your questions:
The timeline overlaps with the events of the Game of Thrones TV show and some of those events will show up in your story. They are not fixed though as your characters may change what happens. And as many important characters have done in GoT, yours may die too.
Your characters will all be members of the same house. Some may be blood, but you don't have to be.
The PCs can basically hold any position in the House, from Lord down to the lowliest retainer. Some positions require investment to make them available.
If you have any additional questions, please contact me in game, as I'm not looking at this thread.