The clutch of on a Toyota Hiace van can be adjusted if there are mechanical issues. The instructions on how to adjust the clutch should be found in the owner manual. This is considered a major repair therefor seeking a professional to do the work may be best.
if your van has rear drum brakes, adjust them up until there is a slight drag on the brakes. this usually does the trick to tighten up the parking brake.
The 1998 Toyota headlight have two adjustment screws. There is an adjustment screw on the top and bottom of the headlight. Turn the screws to adjust the headlight.