Once you have successfully setup your hooks in GoHighLevel you will soon start to see CRM sources begin to populate in your account.
Once a CRM source is in your account you may connect it to an existing client or connect to new clients as their being added.
CRM sources are a collection of all 5 event hooks for a single client. You do not need to have all 5 hooks setup. For example, if you wish you can only setup the leads hook to know when Facebook to GHL integration breaks.