everyone above is correct, you should get proper instruction if you want to use a bokken correctly. try and find an Iaido dojo near you where you can study. i'm sorry i don't know any sites.
Iaido is the japanese art of 'drawing the sword' which is about drawing your sword faster than you opponent disabling or killing them faster - bit like a gun-draw thing in the wild west. it has been used in its present form for about 400 years now making it one of the oldest martial arts still practised. it is similar, if not, what the samurai used as they're style in sword-fighting.
i will warn you that Iaido takes years to perfect and is no something that can be rushed. there is usually no sparring and the lessons are mostly doing katas/ forms. and you should never use or really even touch are proper shinken (a katana with fully sharpened blade) until sensei tells you unless you don't mind losing your fingers lol!!
i hope this helps. i'm also going to guess that you learn kobudo as part of your karate training by the list of weapons you have given.
Go seek the advise of a qualified instructor.