Hello Vincent,
By default an import module exists for Winbooks in Odoo.
To access it you need to go into the Accounting app > Settings > Accounting Import section.

Once you have clicked on that button you will have following view and will be able to upload your data coming from Winbooks.

You will be able to upload your data coming from Winbooks by uploading a full back-up from that software. As explained in the above screenshot you need to go into Maintenance > Back-up of Winbooks to have that file.
If you have any issue regarding the import I invite you to contact odoo.com/help. The colleagues from the support team will make sure to help you get through.
I hope this helps you further and welcome on Odoo.