Just draw level DFD 1

Draw DFD Level 1, Use case Model and Sequence diagram (for any 2 important Use cases).

Design a system for a movie shop, in order to handle ordering of movies and browsing of the catalogue of the store, and user subscriptions with rechargeable cards. Only subscribers are allowed hiring movies with their own card. Credit is updated on the card during rent operations. Both users and subscribers can buy a movie and their data are saved in the related order. When a movie is not available it is ordered.