[@Gnome Johnson] It's a good sheet but there are some minor tweaks. Instead of doctors and churches, the terminology would be maesters and septs. And as for the character's healing ability itself, I'd prefer if his supposed abilities are more open to interpretation. We have examples of faithful who are purported to have miraculous abilities, but it might be better if it's up in the air at least at first, whether your PC's abilities are due to extensive training and skill in healing as well as the placebo effect or whether it's actually anything supernaturally. It might become more overt later, but just like all the other PCs, any potential mystical abilities might be subtle and implied rather than confirmed. 

Also you might consider making the character older to have given him more time to train and more autonomy and agency in the RP. There's also the fact that if the Faith wanted to keep him secret than he would not have been tutored by the Grand Maester or raised in the Red Keep. It'd be perfectly sensible for him to learn healing from septons and other faithful and grow up in the Great Sept.