Buy a bulk loader and a bulk film with re-usable cassettes or use manufacturers' film cassettes that have been used and attach end of bulk film to the 2-3 cms that remain when a film has been cut off. When you open the bulk loader it is more or less self explanatory as to how you load it but instructions with the loader are usually provided.

Do a search here on bulk loaders Plenty of posts on different loaders and their merits or faults.

If I can bulk load then anybody can bulk load