Stark/Martell

New player first attempt at building deck.

Hello and salutations. I've just began my adventure with 2nd edition of AGoT. Along with other friends we bought 3 starter sets and each of us took 2 houses. This is what I've put together. Any Advice would be welcomed.
Main idea is to play aggro on beginning either opening with Sneak Attack if I have Arya/Edric for some stealth and Winter is coming to make a board clear on round 2, or if that's impossible go for Heads on spikes. After that continue beating. Catelyn and Bran should provide some control for mid game, and renown and Sansa for possible closing up if it goes to late game. Martell provide me with extra intrigue icons ans some utility.
So far low draw with just counting coppers and little finger is main problem.
I'm not very sold on Arianne Martell as beside being able to sneak Wildling horde for discount, and some shenanigans with her attacking, and then putting someone else in her place I haven't got much out of her.
I also think cost's are quite high, I do have several bears and I'm usually able to get a good setup with 4-5 cards, and usually be able to build up after being hit by Wildfire, but sometimes I'm just able to put a single character and get Marched to the wall, so some lowering the costs could be useful.
As I said any advice would be welcomed.