Yes you can be Brudvir and craft Neran armor, the trick will be getting materials and the techniques to craft them but if you can secure these things nothing stops you.
Whether you get the bloodline pledge, or a simple adventurer pledge, you will be able to spark into a blacksmith family of your choosing. With bloodline though you can also customize whatever family you start as during exposition using any Expo points you receive or purchase.
Yes, you can be a blacksmith and a skilled warrior. However characters Do die of old age, so the more things you do the less time you have to perfect each thing. So if you want to become a master blacksmith And a master warrior it will take more effort on your part.