Yes, the 'Registration Packages' stuff in Selfreg is to allow for paid registration.
It requires the Cart, CGEcommerceBase, and Orders module... and a compatible payment gateway.
Essentially, you setup the ecommerce system, create the packages, and then just call {SelfRegistration} in the page content/template somewhere.
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-------------------- If you can't bother explaining your problem well, you shouldn't expect much in the way of assistance.
I see this instruction in Selfreg - Please also select Selfregistration as a source module from CGEcommerceBase, and configure the "Paid Registration" Tab. Additionally, you must enable package selection above.
Yet in CGEcommerce Base, or anywhere else, there is no such tab. With this setup my Orders tag shows up nothing - can add to cart, but can't checkout. Very stuck + confused, as I've setup standard CMSMS stores using products/orders/cart system.