I would like to know how to start a medical trust fund/foundation in memory of my daughter who died of cancer, to help other children and adults in Vanuatu and other third world countries who do not have access to adequate medical services and resources to provide proper diagnosis and treatment such as chemotherapy and radiotherapy.

And also, is there a difference between a trust and a foundation and which is proper for this situation

Fr_Chuck

One can merely start a trust fund by going into any bank and setting one up.
Assuming you want it to be non profit, you will have to set up a non profit organization to own and operate the trust