i know deadpool had military training which explains his skill with guns, does anyone know where he learn't to use edged weapons? a japanese sword and sai denote japanese martial arts training, has that been explained in comics?

Try here.

http://www.comicvine.com/deadpool/7606/

its not a bad synopsis of the great deadpool but still doesn't say where or how he learn't to use edge weapons...?

Maybe he taught himself? Deadpool seems pretty pro-efficient with all forms of melee weapons.

I'd say Taskmaster, but I cant say for sure.