With the help of the addons_path parameter, you can load your own add-on modules into Odoo. When Odoo initializes a new database, it will search for one of these directories that's been given in the addons_path configuration parameter. Odoo will search on these directories for the potential add-on module. Directories listed in addons_path are expected to contain subdirectories, each of which is an add-on module. After the initialization of the database, you will be able to install modules that are given in these directories.