I am building brick fence posts for a privacy fence of 340' long and 6' high. Not being a mason or familiar with masonry at all I have many questions. I have been reading on how to build them and I was wondering if it is better to build the posts completely out of brick with the center filled with mortar like I have been reading or if it would be better/possible to sink a 4x4 post then brick around the post? I know if I build completely out of brick I need to make footers. **Twice the dimension of posts and 8"-12" thick. Also, what dimension of post should be used for this purpose? I am unsure how to attach the stringing 2x4s between the posts to the brick. I plan on doing shadow box pickets.