When a user signs on the Sci-GaIA Online Courses, he/she is automatically added to the "students" group. To become a "teacher" one has to explicitly ask for that role and the service administrators will grant/deny it. This has been conceived this way to avoid polluting the service with too many test courses and simple proofs of concept.
We have received your request to become a "teacher" and we will grant it on Monday morning.
In the meantime, I suggest you (and everyone else wanting to test the service) to enroll and take the OpenEdx demo course available in the system.
Concerning "area, learning goals, size, content" those are entirely up to the teachers provided that there is some link to e-infrastructure and open science concepts.
Concerning "accreditation", OpenEdx provides a whole set of functionalities, including badges and certificates, also for paid courses, but I think that this relevant topic has to be discussed within the Sci-GaIA Consortium, or at least within WP1.