it's about '150 meters(145 yards)' north-east of the entrance to the dark forest,or south of the graveyard(where you get kidnaped girl quest)..
it's a small castle with practice targets in the backyard..

I DON'T WANT TO SPOIL IT FOR YOU DOUG;BUT REST ASSURED,ON THE END YOU GET THE GIRL,KILL THE BAD GUYS AND SAVE THE ENTIRE PLANET!