National racing bodies also wanted to contribute to the running of the trust, Bellew said yesterday.
"The Jockeys' Association through Darryl Bradley want to be involved, the Trainers' Association want to be involved and New Zealand Racing are going to play a big hand in the process."
Emotional support for the three children at this time was paramount, Bellew said. "The key for us as as a local racing community is to insulate Rebecca's children. To be struck down and to lose your mum is shocking, but it is even more shocking at this time of year."
People who want to contribute to the trust should contact the Gallop South office.
Once the trust was formalised donation avenues would be advertised, especially on social media, Bellew said.
The Riverton community, where Black lived, is also mourning the loss of the jockey.
The 40-year-old had recently set up the horse riding business, Riverton Horses, in the town which taught locals how to improve their riding skills.
Black's friend Ruth Wong-Sang remembers the horsewoman as a passionate and hard working family-orientated person.