This is the 21th century. metallurgy is a well established technology. There are no great secrets known only to a few adept masters. If you really want to know how to make a wonderful sword, make up a set of specifications. Almost any competent metallurgist will be able to tell you if your requirements can be met and if so, how it can be done. You could probably find a ready made blade that is almost as good as any custom made one you could have manufactured.