Where can I find information regarding maintenance training organisation Part 147

On the AESA website:
https://www.seguridadaerea.gob.es/Organisations/Training Organisations/Maintenance Training Organisations (Part 147)

Information on the approval procedure can be found in the Applicant Information Guide FOR-P147-P01-GU01.

Technical requirements on the Organisation Manual can be found in the FOR-P147-P01-DT01 guide.

In the guide FOR-P147-P01-DT04 you can find the technical requirements on the personnel of the organization