Guidelines:
Before creating a corpus, it is recommended to establish a data management plan and to follow the FAIR principles (to produce Findable, Accessible, Interoperable, Reusable data).
Before using any corpus, it is recommended to find out about associated licenses and contact, if possible, the producers or managers of corpora to find out about any restrictions.
In both cases, you can ask for help from a research support staff (university library, House of Human Sciences (MSH), research departments, etc.) or by following a training/self-training course thanks to online resources like Doranum, Inist webinars…