.. you’re asking me. my apologies
you can store your media on the internal drive,
but I wouldn’t recommend it. Get an external drive with firewire800 connection or thunderbolt if you have a newer mac mini, and digitize/import and store your media on the external drive. your mac will thank you for it in the long run and may run a bit quicker.
plus you can take your project to another system if all of your media is stored on the external drive.
-H