You can create a Stebby account being logged into your personal account by clicking on your name at the top right and then choosing "Create a new group". From that view, you can always change the role between your accounts, because when you log in to Stebby, you are in your personal account at first.
Joining the Stebby environment is always free.
There is no monthly fee for Standard Package Service Providers. For Basic, Bronze, SIlver and Gold packages, the service fee is applied according to the agreed service fee percentage. More detailed information can be found in the package description.