yes you are allowed to upload pics with PLE. I guess your normals are flipped. you may have a look at the faces´ normals from the horn.
you´ll run into nonmanifold geometry quite often further on. understanding what nonmanifold geometry really is will save you a lot of time. by avoiding to even create nonmanifold geometry in the first place you don´t need to clean it up later.
everything starts and ends in the right place at the right time.