I'm not the most familair of Game of Thrones when compared to Eberron and especially Faerun. I played, read and watched most contents related to Faerun. But this could perhaps play well with a character from Faerun who is introduced to Westeros. But I would most likely will have some questions on how things are and work in Westeros, in and out of character. If you have any links that you think would be great source of information that relates to this campaign, that would be helpful and greatly appreciated. 

The original world idea does sound fun since unlike the other pre existing settings, these worlds sound like a nice fun treat to be surprised and venture in.

But again, I just feel concern that my lack of knowledge with Game of Thrones may hinder progress of the campaign as I would have to spend time learning about it while being busy with irl work.

Another question I would like to add is how should we determine our ability scores?