Most of the pre-departure training courses are done by the National Agencies or Salto Resource Centers. Regardless of that, you can also organize your own pre-departure training training for the volunteer, in order to ensure that the elements that where not tackled during thetraining course organized by the NA will be deliverd to the volunteer. Also take into consideration that the N.A.'s do not go into specific topics like placement, project or volunteer personal issues. All this you, togher with the hosting organization, you must prepare.
Below is a list that might be usefull for you as a start. You can add or remove items from this list, as it suites your needs: