Ok I have a tricky pricing situation

I have a company wanting to purchase the use of one of our Gold Coast landscape images, but the image will be used on a postcard. These postcards will not be sold by the company, yet used as a part of their in house training. They get people that attend the training to write on the postcards (answer to something they learnt) and then 3 months or so down the track they send the postcards to these people as a friendly "reminder" of what they learnt that day.

So I don't have a number of how many cards will be produced or for how long? (I'm guessing that info would be helpful)

So I'm hoping someone could shed some "better" light on how my Dad and myself could handle this business matter, as it's something I never thought would ever be ask of me?

Any answers?