First, create a new unique folder on video hard drive for the footage, like "Card_01" or whatever. From SD card, copy EVERYTHING to that new folder, keeping all folders structure from SD card intact. It is important to do this, rather than just picking certain video files.
Create a NEW FOLDER for each SD card you need to copy over.
Once card is copied over, in Premiere you will use Media Browser to import, rather than File > Import.
Media Browser will use metadata found in other files from SD card to best figure things out - for instance if you made a long recording that camera broke into smaller 2GB or 4GB chunks (spanned clips), Premiere will import so that you get one long clip to edit with, no breaks between the pieces. Just a lot of little benefits like that by using this method.